Restored prototype 1.7 (#9609).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7853 e93f8b46-1217-0410-a6f0-8f06a7374b81

1 files changed, 3617 insertions, 1855 deletions

diff --git a/public/javascripts/prototype.js b/public/javascripts/prototype.js
index dfe8ab4e1..db86961e4 100644
--- a/public/javascripts/prototype.js
+++ b/public/javascripts/prototype.js
@@ -1,5 +1,5 @@
-/*  Prototype JavaScript framework, version 1.6.0.3
- *  (c) 2005-2008 Sam Stephenson
+/*  Prototype JavaScript framework, version 1.7
+ *  (c) 2005-2010 Sam Stephenson
  *
  *  Prototype is freely distributable under the terms of an MIT-style license.
  *  For details, see the Prototype web site: http://www.prototypejs.org/
@@ -7,32 +7,53 @@
  *--------------------------------------------------------------------------*/
 
 var Prototype = {
-  Version: '1.6.0.3',
 
-  Browser: {
-    IE:     !!(window.attachEvent &&
-      navigator.userAgent.indexOf('Opera') === -1),
-    Opera:  navigator.userAgent.indexOf('Opera') > -1,
-    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
-    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
-      navigator.userAgent.indexOf('KHTML') === -1,
-    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
-  },
+  Version: '1.7',
+
+  Browser: (function(){
+    var ua = navigator.userAgent;
+    var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
+    return {
+      IE:             !!window.attachEvent && !isOpera,
+      Opera:          isOpera,
+      WebKit:         ua.indexOf('AppleWebKit/') > -1,
+      Gecko:          ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
+      MobileSafari:   /Apple.*Mobile/.test(ua)
+    }
+  })(),
 
   BrowserFeatures: {
     XPath: !!document.evaluate,
+
     SelectorsAPI: !!document.querySelector,
-    ElementExtensions: !!window.HTMLElement,
-    SpecificElementExtensions:
-      document.createElement('div')['__proto__'] &&
-      document.createElement('div')['__proto__'] !==
-        document.createElement('form')['__proto__']
+
+    ElementExtensions: (function() {
+      var constructor = window.Element || window.HTMLElement;
+      return !!(constructor && constructor.prototype);
+    })(),
+    SpecificElementExtensions: (function() {
+      if (typeof window.HTMLDivElement !== 'undefined')
+        return true;
+
+      var div = document.createElement('div'),
+          form = document.createElement('form'),
+          isSupported = false;
+
+      if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
+        isSupported = true;
+      }
+
+      div = form = null;
+
+      return isSupported;
+    })()
   },
 
   ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
   JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
 
   emptyFunction: function() { },
+
   K: function(x) { return x }
 };
 
@@ -40,9 +61,38 @@ if (Prototype.Browser.MobileSafari)
   Prototype.BrowserFeatures.SpecificElementExtensions = false;
 
 
+var Abstract = { };
+
+
+var Try = {
+  these: function() {
+    var returnValue;
+
+    for (var i = 0, length = arguments.length; i < length; i++) {
+      var lambda = arguments[i];
+      try {
+        returnValue = lambda();
+        break;
+      } catch (e) { }
+    }
+
+    return returnValue;
+  }
+};
+
 /* Based on Alex Arnell's inheritance implementation. */
-var Class = {
-  create: function() {
+
+var Class = (function() {
+
+  var IS_DONTENUM_BUGGY = (function(){
+    for (var p in { toString: 1 }) {
+      if (p === 'toString') return false;
+    }
+    return true;
+  })();
+
+  function subclass() {};
+  function create() {
     var parent = null, properties = $A(arguments);
     if (Object.isFunction(properties[0]))
       parent = properties.shift();
@@ -56,39 +106,39 @@ var Class = {
     klass.subclasses = [];
 
     if (parent) {
-      var subclass = function() { };
       subclass.prototype = parent.prototype;
       klass.prototype = new subclass;
       parent.subclasses.push(klass);
     }
 
-    for (var i = 0; i < properties.length; i++)
+    for (var i = 0, length = properties.length; i < length; i++)
       klass.addMethods(properties[i]);
 
     if (!klass.prototype.initialize)
       klass.prototype.initialize = Prototype.emptyFunction;
 
     klass.prototype.constructor = klass;
-
     return klass;
   }
-};
 
-Class.Methods = {
-  addMethods: function(source) {
-    var ancestor   = this.superclass && this.superclass.prototype;
-    var properties = Object.keys(source);
+  function addMethods(source) {
+    var ancestor   = this.superclass && this.superclass.prototype,
+        properties = Object.keys(source);
 
-    if (!Object.keys({ toString: true }).length)
-      properties.push("toString", "valueOf");
+    if (IS_DONTENUM_BUGGY) {
+      if (source.toString != Object.prototype.toString)
+        properties.push("toString");
+      if (source.valueOf != Object.prototype.valueOf)
+        properties.push("valueOf");
+    }
 
     for (var i = 0, length = properties.length; i < length; i++) {
       var property = properties[i], value = source[property];
       if (ancestor && Object.isFunction(value) &&
-          value.argumentNames().first() == "$super") {
+          value.argumentNames()[0] == "$super") {
         var method = value;
         value = (function(m) {
-          return function() { return ancestor[m].apply(this, arguments) };
+          return function() { return ancestor[m].apply(this, arguments); };
         })(property).wrap(method);
 
         value.valueOf = method.valueOf.bind(method);
@@ -99,198 +149,338 @@ Class.Methods = {
 
     return this;
   }
-};
 
-var Abstract = { };
+  return {
+    create: create,
+    Methods: {
+      addMethods: addMethods
+    }
+  };
+})();
+(function() {
 
-Object.extend = function(destination, source) {
-  for (var property in source)
-    destination[property] = source[property];
-  return destination;
-};
+  var _toString = Object.prototype.toString,
+      NULL_TYPE = 'Null',
+      UNDEFINED_TYPE = 'Undefined',
+      BOOLEAN_TYPE = 'Boolean',
+      NUMBER_TYPE = 'Number',
+      STRING_TYPE = 'String',
+      OBJECT_TYPE = 'Object',
+      FUNCTION_CLASS = '[object Function]',
+      BOOLEAN_CLASS = '[object Boolean]',
+      NUMBER_CLASS = '[object Number]',
+      STRING_CLASS = '[object String]',
+      ARRAY_CLASS = '[object Array]',
+      DATE_CLASS = '[object Date]',
+      NATIVE_JSON_STRINGIFY_SUPPORT = window.JSON &&
+        typeof JSON.stringify === 'function' &&
+        JSON.stringify(0) === '0' &&
+        typeof JSON.stringify(Prototype.K) === 'undefined';
+
+  function Type(o) {
+    switch(o) {
+      case null: return NULL_TYPE;
+      case (void 0): return UNDEFINED_TYPE;
+    }
+    var type = typeof o;
+    switch(type) {
+      case 'boolean': return BOOLEAN_TYPE;
+      case 'number':  return NUMBER_TYPE;
+      case 'string':  return STRING_TYPE;
+    }
+    return OBJECT_TYPE;
+  }
+
+  function extend(destination, source) {
+    for (var property in source)
+      destination[property] = source[property];
+    return destination;
+  }
 
-Object.extend(Object, {
-  inspect: function(object) {
+  function inspect(object) {
     try {
-      if (Object.isUndefined(object)) return 'undefined';
+      if (isUndefined(object)) return 'undefined';
       if (object === null) return 'null';
       return object.inspect ? object.inspect() : String(object);
     } catch (e) {
       if (e instanceof RangeError) return '...';
       throw e;
     }
-  },
+  }
 
-  toJSON: function(object) {
-    var type = typeof object;
-    switch (type) {
-      case 'undefined':
-      case 'function':
-      case 'unknown': return;
-      case 'boolean': return object.toString();
+  function toJSON(value) {
+    return Str('', { '': value }, []);
+  }
+
+  function Str(key, holder, stack) {
+    var value = holder[key],
+        type = typeof value;
+
+    if (Type(value) === OBJECT_TYPE && typeof value.toJSON === 'function') {
+      value = value.toJSON(key);
     }
 
-    if (object === null) return 'null';
-    if (object.toJSON) return object.toJSON();
-    if (Object.isElement(object)) return;
+    var _class = _toString.call(value);
 
-    var results = [];
-    for (var property in object) {
-      var value = Object.toJSON(object[property]);
-      if (!Object.isUndefined(value))
-        results.push(property.toJSON() + ': ' + value);
+    switch (_class) {
+      case NUMBER_CLASS:
+      case BOOLEAN_CLASS:
+      case STRING_CLASS:
+        value = value.valueOf();
     }
 
-    return '{' + results.join(', ') + '}';
-  },
+    switch (value) {
+      case null: return 'null';
+      case true: return 'true';
+      case false: return 'false';
+    }
+
+    type = typeof value;
+    switch (type) {
+      case 'string':
+        return value.inspect(true);
+      case 'number':
+        return isFinite(value) ? String(value) : 'null';
+      case 'object':
+
+        for (var i = 0, length = stack.length; i < length; i++) {
+          if (stack[i] === value) { throw new TypeError(); }
+        }
+        stack.push(value);
+
+        var partial = [];
+        if (_class === ARRAY_CLASS) {
+          for (var i = 0, length = value.length; i < length; i++) {
+            var str = Str(i, value, stack);
+            partial.push(typeof str === 'undefined' ? 'null' : str);
+          }
+          partial = '[' + partial.join(',') + ']';
+        } else {
+          var keys = Object.keys(value);
+          for (var i = 0, length = keys.length; i < length; i++) {
+            var key = keys[i], str = Str(key, value, stack);
+            if (typeof str !== "undefined") {
+               partial.push(key.inspect(true)+ ':' + str);
+             }
+          }
+          partial = '{' + partial.join(',') + '}';
+        }
+        stack.pop();
+        return partial;
+    }
+  }
+
+  function stringify(object) {
+    return JSON.stringify(object);
+  }
 
-  toQueryString: function(object) {
+  function toQueryString(object) {
     return $H(object).toQueryString();
-  },
+  }
 
-  toHTML: function(object) {
+  function toHTML(object) {
     return object && object.toHTML ? object.toHTML() : String.interpret(object);
-  },
+  }
 
-  keys: function(object) {
-    var keys = [];
-    for (var property in object)
-      keys.push(property);
-    return keys;
-  },
+  function keys(object) {
+    if (Type(object) !== OBJECT_TYPE) { throw new TypeError(); }
+    var results = [];
+    for (var property in object) {
+      if (object.hasOwnProperty(property)) {
+        results.push(property);
+      }
+    }
+    return results;
+  }
 
-  values: function(object) {
-    var values = [];
+  function values(object) {
+    var results = [];
     for (var property in object)
-      values.push(object[property]);
-    return values;
-  },
+      results.push(object[property]);
+    return results;
+  }
 
-  clone: function(object) {
-    return Object.extend({ }, object);
-  },
+  function clone(object) {
+    return extend({ }, object);
+  }
 
-  isElement: function(object) {
+  function isElement(object) {
     return !!(object && object.nodeType == 1);
-  },
+  }
 
-  isArray: function(object) {
-    return object != null && typeof object == "object" &&
-      'splice' in object && 'join' in object;
-  },
+  function isArray(object) {
+    return _toString.call(object) === ARRAY_CLASS;
+  }
+
+  var hasNativeIsArray = (typeof Array.isArray == 'function')
+    && Array.isArray([]) && !Array.isArray({});
 
-  isHash: function(object) {
+  if (hasNativeIsArray) {
+    isArray = Array.isArray;
+  }
+
+  function isHash(object) {
     return object instanceof Hash;
-  },
+  }
 
-  isFunction: function(object) {
-    return typeof object == "function";
-  },
+  function isFunction(object) {
+    return _toString.call(object) === FUNCTION_CLASS;
+  }
 
-  isString: function(object) {
-    return typeof object == "string";
-  },
+  function isString(object) {
+    return _toString.call(object) === STRING_CLASS;
+  }
 
-  isNumber: function(object) {
-    return typeof object == "number";
-  },
+  function isNumber(object) {
+    return _toString.call(object) === NUMBER_CLASS;
+  }
 
-  isUndefined: function(object) {
-    return typeof object == "undefined";
+  function isDate(object) {
+    return _toString.call(object) === DATE_CLASS;
+  }
+
+  function isUndefined(object) {
+    return typeof object === "undefined";
   }
-});
 
-Object.extend(Function.prototype, {
-  argumentNames: function() {
-    var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
+  extend(Object, {
+    extend:        extend,
+    inspect:       inspect,
+    toJSON:        NATIVE_JSON_STRINGIFY_SUPPORT ? stringify : toJSON,
+    toQueryString: toQueryString,
+    toHTML:        toHTML,
+    keys:          Object.keys || keys,
+    values:        values,
+    clone:         clone,
+    isElement:     isElement,
+    isArray:       isArray,
+    isHash:        isHash,
+    isFunction:    isFunction,
+    isString:      isString,
+    isNumber:      isNumber,
+    isDate:        isDate,
+    isUndefined:   isUndefined
+  });
+})();
+Object.extend(Function.prototype, (function() {
+  var slice = Array.prototype.slice;
+
+  function update(array, args) {
+    var arrayLength = array.length, length = args.length;
+    while (length--) array[arrayLength + length] = args[length];
+    return array;
+  }
+
+  function merge(array, args) {
+    array = slice.call(array, 0);
+    return update(array, args);
+  }
+
+  function argumentNames() {
+    var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
+      .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
       .replace(/\s+/g, '').split(',');
     return names.length == 1 && !names[0] ? [] : names;
-  },
+  }
 
-  bind: function() {
+  function bind(context) {
     if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
-    var __method = this, args = $A(arguments), object = args.shift();
+    var __method = this, args = slice.call(arguments, 1);
     return function() {
-      return __method.apply(object, args.concat($A(arguments)));
+      var a = merge(args, arguments);
+      return __method.apply(context, a);
     }
-  },
+  }
 
-  bindAsEventListener: function() {
-    var __method = this, args = $A(arguments), object = args.shift();
+  function bindAsEventListener(context) {
+    var __method = this, args = slice.call(arguments, 1);
     return function(event) {
-      return __method.apply(object, [event || window.event].concat(args));
+      var a = update([event || window.event], args);
+      return __method.apply(context, a);
     }
-  },
+  }
 
-  curry: function() {
+  function curry() {
     if (!arguments.length) return this;
-    var __method = this, args = $A(arguments);
+    var __method = this, args = slice.call(arguments, 0);
     return function() {
-      return __method.apply(this, args.concat($A(arguments)));
+      var a = merge(args, arguments);
+      return __method.apply(this, a);
     }
-  },
+  }
 
-  delay: function() {
-    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
+  function delay(timeout) {
+    var __method = this, args = slice.call(arguments, 1);
+    timeout = timeout * 1000;
     return window.setTimeout(function() {
       return __method.apply(__method, args);
     }, timeout);
-  },
+  }
 
-  defer: function() {
-    var args = [0.01].concat($A(arguments));
+  function defer() {
+    var args = update([0.01], arguments);
     return this.delay.apply(this, args);
-  },
+  }
 
-  wrap: function(wrapper) {
+  function wrap(wrapper) {
     var __method = this;
     return function() {
-      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
+      var a = update([__method.bind(this)], arguments);
+      return wrapper.apply(this, a);
     }
-  },
+  }
 
-  methodize: function() {
+  function methodize() {
     if (this._methodized) return this._methodized;
     var __method = this;
     return this._methodized = function() {
-      return __method.apply(null, [this].concat($A(arguments)));
+      var a = update([this], arguments);
+      return __method.apply(null, a);
     };
   }
-});
 
-Date.prototype.toJSON = function() {
-  return '"' + this.getUTCFullYear() + '-' +
-    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
-    this.getUTCDate().toPaddedString(2) + 'T' +
-    this.getUTCHours().toPaddedString(2) + ':' +
-    this.getUTCMinutes().toPaddedString(2) + ':' +
-    this.getUTCSeconds().toPaddedString(2) + 'Z"';
-};
+  return {
+    argumentNames:       argumentNames,
+    bind:                bind,
+    bindAsEventListener: bindAsEventListener,
+    curry:               curry,
+    delay:               delay,
+    defer:               defer,
+    wrap:                wrap,
+    methodize:           methodize
+  }
+})());
 
-var Try = {
-  these: function() {
-    var returnValue;
 
-    for (var i = 0, length = arguments.length; i < length; i++) {
-      var lambda = arguments[i];
-      try {
-        returnValue = lambda();
-        break;
-      } catch (e) { }
-    }
 
-    return returnValue;
+(function(proto) {
+
+
+  function toISOString() {
+    return this.getUTCFullYear() + '-' +
+      (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
+      this.getUTCDate().toPaddedString(2) + 'T' +
+      this.getUTCHours().toPaddedString(2) + ':' +
+      this.getUTCMinutes().toPaddedString(2) + ':' +
+      this.getUTCSeconds().toPaddedString(2) + 'Z';
   }
-};
+
+
+  function toJSON() {
+    return this.toISOString();
+  }
+
+  if (!proto.toISOString) proto.toISOString = toISOString;
+  if (!proto.toJSON) proto.toJSON = toJSON;
+
+})(Date.prototype);
+
 
 RegExp.prototype.match = RegExp.prototype.test;
 
 RegExp.escape = function(str) {
   return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
 };
-
-/*--------------------------------------------------------------------------*/
-
 var PeriodicalExecuter = Class.create({
   initialize: function(callback, frequency) {
     this.callback = callback;
@@ -319,8 +509,10 @@ var PeriodicalExecuter = Class.create({
       try {
         this.currentlyExecuting = true;
         this.execute();
-      } finally {
         this.currentlyExecuting = false;
+      } catch(e) {
+        this.currentlyExecuting = false;
+        throw e;
       }
     }
   }
@@ -339,10 +531,28 @@ Object.extend(String, {
   }
 });
 
-Object.extend(String.prototype, {
-  gsub: function(pattern, replacement) {
+Object.extend(String.prototype, (function() {
+  var NATIVE_JSON_PARSE_SUPPORT = window.JSON &&
+    typeof JSON.parse === 'function' &&
+    JSON.parse('{"test": true}').test;
+
+  function prepareReplacement(replacement) {
+    if (Object.isFunction(replacement)) return replacement;
+    var template = new Template(replacement);
+    return function(match) { return template.evaluate(match) };
+  }
+
+  function gsub(pattern, replacement) {
     var result = '', source = this, match;
-    replacement = arguments.callee.prepareReplacement(replacement);
+    replacement = prepareReplacement(replacement);
+
+    if (Object.isString(pattern))
+      pattern = RegExp.escape(pattern);
+
+    if (!(pattern.length || pattern.source)) {
+      replacement = replacement('');
+      return replacement + source.split('').join(replacement) + replacement;
+    }
 
     while (source.length > 0) {
       if (match = source.match(pattern)) {
@@ -354,76 +564,72 @@ Object.extend(String.prototype, {
       }
     }
     return result;
-  },
+  }
 
-  sub: function(pattern, replacement, count) {
-    replacement = this.gsub.prepareReplacement(replacement);
+  function sub(pattern, replacement, count) {
+    replacement = prepareReplacement(replacement);
     count = Object.isUndefined(count) ? 1 : count;
 
     return this.gsub(pattern, function(match) {
       if (--count < 0) return match[0];
       return replacement(match);
     });
-  },
+  }
 
-  scan: function(pattern, iterator) {
+  function scan(pattern, iterator) {
     this.gsub(pattern, iterator);
     return String(this);
-  },
+  }
 
-  truncate: function(length, truncation) {
+  function truncate(length, truncation) {
     length = length || 30;
     truncation = Object.isUndefined(truncation) ? '...' : truncation;
     return this.length > length ?
       this.slice(0, length - truncation.length) + truncation : String(this);
-  },
+  }
 
-  strip: function() {
+  function strip() {
     return this.replace(/^\s+/, '').replace(/\s+$/, '');
-  },
+  }
 
-  stripTags: function() {
-    return this.replace(/<\/?[^>]+>/gi, '');
-  },
+  function stripTags() {
+    return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
+  }
 
-  stripScripts: function() {
+  function stripScripts() {
     return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
-  },
+  }
 
-  extractScripts: function() {
-    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
-    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
+  function extractScripts() {
+    var matchAll = new RegExp(Prototype.ScriptFragment, 'img'),
+        matchOne = new RegExp(Prototype.ScriptFragment, 'im');
     return (this.match(matchAll) || []).map(function(scriptTag) {
       return (scriptTag.match(matchOne) || ['', ''])[1];
     });
-  },
+  }
 
-  evalScripts: function() {
+  function evalScripts() {
     return this.extractScripts().map(function(script) { return eval(script) });
-  },
+  }
 
-  escapeHTML: function() {
-    var self = arguments.callee;
-    self.text.data = this;
-    return self.div.innerHTML;
-  },
+  function escapeHTML() {
+    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
+  }
+
+  function unescapeHTML() {
+    return this.stripTags().replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
+  }
 
-  unescapeHTML: function() {
-    var div = new Element('div');
-    div.innerHTML = this.stripTags();
-    return div.childNodes[0] ? (div.childNodes.length > 1 ?
-      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
-      div.childNodes[0].nodeValue) : '';
-  },
 
-  toQueryParams: function(separator) {
+  function toQueryParams(separator) {
     var match = this.strip().match(/([^?#]*)(#.*)?$/);
     if (!match) return { };
 
     return match[1].split(separator || '&').inject({ }, function(hash, pair) {
       if ((pair = pair.split('='))[0]) {
-        var key = decodeURIComponent(pair.shift());
-        var value = pair.length > 1 ? pair.join('=') : pair[0];
+        var key = decodeURIComponent(pair.shift()),
+            value = pair.length > 1 ? pair.join('=') : pair[0];
+
         if (value != undefined) value = decodeURIComponent(value);
 
         if (key in hash) {
@@ -434,128 +640,144 @@ Object.extend(String.prototype, {
       }
       return hash;
     });
-  },
+  }
 
-  toArray: function() {
+  function toArray() {
     return this.split('');
-  },
+  }
 
-  succ: function() {
+  function succ() {
     return this.slice(0, this.length - 1) +
       String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
-  },
+  }
 
-  times: function(count) {
+  function times(count) {
     return count < 1 ? '' : new Array(count + 1).join(this);
-  },
-
-  camelize: function() {
-    var parts = this.split('-'), len = parts.length;
-    if (len == 1) return parts[0];
-
-    var camelized = this.charAt(0) == '-'
-      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
-      : parts[0];
-
-    for (var i = 1; i < len; i++)
-      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
+  }
 
-    return camelized;
-  },
+  function camelize() {
+    return this.replace(/-+(.)?/g, function(match, chr) {
+      return chr ? chr.toUpperCase() : '';
+    });
+  }
 
-  capitalize: function() {
+  function capitalize() {
     return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
-  },
+  }
 
-  underscore: function() {
-    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
-  },
+  function underscore() {
+    return this.replace(/::/g, '/')
+               .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
+               .replace(/([a-z\d])([A-Z])/g, '$1_$2')
+               .replace(/-/g, '_')
+               .toLowerCase();
+  }
 
-  dasherize: function() {
-    return this.gsub(/_/,'-');
-  },
+  function dasherize() {
+    return this.replace(/_/g, '-');
+  }
 
-  inspect: function(useDoubleQuotes) {
-    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
-      var character = String.specialChar[match[0]];
-      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
+  function inspect(useDoubleQuotes) {
+    var escapedString = this.replace(/[\x00-\x1f\\]/g, function(character) {
+      if (character in String.specialChar) {
+        return String.specialChar[character];
+      }
+      return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
     });
     if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
     return "'" + escapedString.replace(/'/g, '\\\'') + "'";
-  },
-
-  toJSON: function() {
-    return this.inspect(true);
-  },
+  }
 
-  unfilterJSON: function(filter) {
-    return this.sub(filter || Prototype.JSONFilter, '#{1}');
-  },
+  function unfilterJSON(filter) {
+    return this.replace(filter || Prototype.JSONFilter, '$1');
+  }
 
-  isJSON: function() {
+  function isJSON() {
     var str = this;
     if (str.blank()) return false;
-    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
-    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
-  },
+    str = str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
+    str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
+    str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
+    return (/^[\],:{}\s]*$/).test(str);
+  }
 
-  evalJSON: function(sanitize) {
-    var json = this.unfilterJSON();
+  function evalJSON(sanitize) {
+    var json = this.unfilterJSON(),
+        cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
+    if (cx.test(json)) {
+      json = json.replace(cx, function (a) {
+        return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
+      });
+    }
     try {
       if (!sanitize || json.isJSON()) return eval('(' + json + ')');
     } catch (e) { }
     throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
-  },
+  }
+
+  function parseJSON() {
+    var json = this.unfilterJSON();
+    return JSON.parse(json);
+  }
 
-  include: function(pattern) {
+  function include(pattern) {
     return this.indexOf(pattern) > -1;
-  },
+  }
 
-  startsWith: function(pattern) {
-    return this.indexOf(pattern) === 0;
-  },
+  function startsWith(pattern) {
+    return this.lastIndexOf(pattern, 0) === 0;
+  }
 
-  endsWith: function(pattern) {
+  function endsWith(pattern) {
     var d = this.length - pattern.length;
-    return d >= 0 && this.lastIndexOf(pattern) === d;
-  },
+    return d >= 0 && this.indexOf(pattern, d) === d;
+  }
 
-  empty: function() {
+  function empty() {
     return this == '';
-  },
+  }
 
-  blank: function() {
+  function blank() {
     return /^\s*$/.test(this);
-  },
-
-  interpolate: function(object, pattern) {
-    return new Template(this, pattern).evaluate(object);
   }
-});
 
-if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
-  escapeHTML: function() {
-    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
-  },
-  unescapeHTML: function() {
-    return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
+  function interpolate(object, pattern) {
+    return new Template(this, pattern).evaluate(object);
   }
-});
-
-String.prototype.gsub.prepareReplacement = function(replacement) {
-  if (Object.isFunction(replacement)) return replacement;
-  var template = new Template(replacement);
-  return function(match) { return template.evaluate(match) };
-};
-
-String.prototype.parseQuery = String.prototype.toQueryParams;
-
-Object.extend(String.prototype.escapeHTML, {
-  div:  document.createElement('div'),
-  text: document.createTextNode('')
-});
 
-String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);
+  return {
+    gsub:           gsub,
+    sub:            sub,
+    scan:           scan,
+    truncate:       truncate,
+    strip:          String.prototype.trim || strip,
+    stripTags:      stripTags,
+    stripScripts:   stripScripts,
+    extractScripts: extractScripts,
+    evalScripts:    evalScripts,
+    escapeHTML:     escapeHTML,
+    unescapeHTML:   unescapeHTML,
+    toQueryParams:  toQueryParams,
+    parseQuery:     toQueryParams,
+    toArray:        toArray,
+    succ:           succ,
+    times:          times,
+    camelize:       camelize,
+    capitalize:     capitalize,
+    underscore:     underscore,
+    dasherize:      dasherize,
+    inspect:        inspect,
+    unfilterJSON:   unfilterJSON,
+    isJSON:         isJSON,
+    evalJSON:       NATIVE_JSON_PARSE_SUPPORT ? parseJSON : evalJSON,
+    include:        include,
+    startsWith:     startsWith,
+    endsWith:       endsWith,
+    empty:          empty,
+    blank:          blank,
+    interpolate:    interpolate
+  };
+})());
 
 var Template = Class.create({
   initialize: function(template, pattern) {
@@ -564,22 +786,23 @@ var Template = Class.create({
   },
 
   evaluate: function(object) {
-    if (Object.isFunction(object.toTemplateReplacements))
+    if (object && Object.isFunction(object.toTemplateReplacements))
       object = object.toTemplateReplacements();
 
     return this.template.gsub(this.pattern, function(match) {
-      if (object == null) return '';
+      if (object == null) return (match[1] + '');
 
       var before = match[1] || '';
       if (before == '\\') return match[2];
 
-      var ctx = object, expr = match[3];
-      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
+      var ctx = object, expr = match[3],
+          pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
+
       match = pattern.exec(expr);
       if (match == null) return before;
 
       while (match != null) {
-        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
+        var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : match[1];
         ctx = ctx[comp];
         if (null == ctx || '' == match[3]) break;
         expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
@@ -594,8 +817,8 @@ Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 
 var $break = { };
 
-var Enumerable = {
-  each: function(iterator, context) {
+var Enumerable = (function() {
+  function each(iterator, context) {
     var index = 0;
     try {
       this._each(function(value) {
@@ -605,17 +828,17 @@ var Enumerable = {
       if (e != $break) throw e;
     }
     return this;
-  },
+  }
 
-  eachSlice: function(number, iterator, context) {
+  function eachSlice(number, iterator, context) {
     var index = -number, slices = [], array = this.toArray();
     if (number < 1) return array;
     while ((index += number) < array.length)
       slices.push(array.slice(index, index+number));
     return slices.collect(iterator, context);
-  },
+  }
 
-  all: function(iterator, context) {
+  function all(iterator, context) {
     iterator = iterator || Prototype.K;
     var result = true;
     this.each(function(value, index) {
@@ -623,9 +846,9 @@ var Enumerable = {
       if (!result) throw $break;
     });
     return result;
-  },
+  }
 
-  any: function(iterator, context) {
+  function any(iterator, context) {
     iterator = iterator || Prototype.K;
     var result = false;
     this.each(function(value, index) {
@@ -633,18 +856,18 @@ var Enumerable = {
         throw $break;
     });
     return result;
-  },
+  }
 
-  collect: function(iterator, context) {
+  function collect(iterator, context) {
     iterator = iterator || Prototype.K;
     var results = [];
     this.each(function(value, index) {
       results.push(iterator.call(context, value, index));
     });
     return results;
-  },
+  }
 
-  detect: function(iterator, context) {
+  function detect(iterator, context) {
     var result;
     this.each(function(value, index) {
       if (iterator.call(context, value, index)) {
@@ -653,32 +876,32 @@ var Enumerable = {
       }
     });
     return result;
-  },
+  }
 
-  findAll: function(iterator, context) {
+  function findAll(iterator, context) {
     var results = [];
     this.each(function(value, index) {
       if (iterator.call(context, value, index))
         results.push(value);
     });
     return results;
-  },
+  }
 
-  grep: function(filter, iterator, context) {
+  function grep(filter, iterator, context) {
     iterator = iterator || Prototype.K;
     var results = [];
 
     if (Object.isString(filter))
-      filter = new RegExp(filter);
+      filter = new RegExp(RegExp.escape(filter));
 
     this.each(function(value, index) {
       if (filter.match(value))
         results.push(iterator.call(context, value, index));
     });
     return results;
-  },
+  }
 
-  include: function(object) {
+  function include(object) {
     if (Object.isFunction(this.indexOf))
       if (this.indexOf(object) != -1) return true;
 
@@ -690,31 +913,31 @@ var Enumerable = {
       }
     });
     return found;
-  },
+  }
 
-  inGroupsOf: function(number, fillWith) {
+  function inGroupsOf(number, fillWith) {
     fillWith = Object.isUndefined(fillWith) ? null : fillWith;
     return this.eachSlice(number, function(slice) {
       while(slice.length < number) slice.push(fillWith);
       return slice;
     });
-  },
+  }
 
-  inject: function(memo, iterator, context) {
+  function inject(memo, iterator, context) {
     this.each(function(value, index) {
       memo = iterator.call(context, memo, value, index);
     });
     return memo;
-  },
+  }
 
-  invoke: function(method) {
+  function invoke(method) {
     var args = $A(arguments).slice(1);
     return this.map(function(value) {
       return value[method].apply(value, args);
     });
-  },
+  }
 
-  max: function(iterator, context) {
+  function max(iterator, context) {
     iterator = iterator || Prototype.K;
     var result;
     this.each(function(value, index) {
@@ -723,9 +946,9 @@ var Enumerable = {
         result = value;
     });
     return result;
-  },
+  }
 
-  min: function(iterator, context) {
+  function min(iterator, context) {
     iterator = iterator || Prototype.K;
     var result;
     this.each(function(value, index) {
@@ -734,9 +957,9 @@ var Enumerable = {
         result = value;
     });
     return result;
-  },
+  }
 
-  partition: function(iterator, context) {
+  function partition(iterator, context) {
     iterator = iterator || Prototype.K;
     var trues = [], falses = [];
     this.each(function(value, index) {
@@ -744,26 +967,26 @@ var Enumerable = {
         trues : falses).push(value);
     });
     return [trues, falses];
-  },
+  }
 
-  pluck: function(property) {
+  function pluck(property) {
     var results = [];
     this.each(function(value) {
       results.push(value[property]);
     });
     return results;
-  },
+  }
 
-  reject: function(iterator, context) {
+  function reject(iterator, context) {
     var results = [];
     this.each(function(value, index) {
       if (!iterator.call(context, value, index))
         results.push(value);
     });
     return results;
-  },
+  }
 
-  sortBy: function(iterator, context) {
+  function sortBy(iterator, context) {
     return this.map(function(value, index) {
       return {
         value: value,
@@ -773,13 +996,13 @@ var Enumerable = {
       var a = left.criteria, b = right.criteria;
       return a < b ? -1 : a > b ? 1 : 0;
     }).pluck('value');
-  },
+  }
 
-  toArray: function() {
+  function toArray() {
     return this.map();
-  },
+  }
 
-  zip: function() {
+  function zip() {
     var iterator = Prototype.K, args = $A(arguments);
     if (Object.isFunction(args.last()))
       iterator = args.pop();
@@ -788,336 +1011,416 @@ var Enumerable = {
     return this.map(function(value, index) {
       return iterator(collections.pluck(index));
     });
-  },
+  }
 
-  size: function() {
+  function size() {
     return this.toArray().length;
-  },
+  }
 
-  inspect: function() {
+  function inspect() {
     return '#<Enumerable:' + this.toArray().inspect() + '>';
   }
-};
 
-Object.extend(Enumerable, {
-  map:     Enumerable.collect,
-  find:    Enumerable.detect,
-  select:  Enumerable.findAll,
-  filter:  Enumerable.findAll,
-  member:  Enumerable.include,
-  entries: Enumerable.toArray,
-  every:   Enumerable.all,
-  some:    Enumerable.any
-});
+
+
+
+
+
+
+
+
+  return {
+    each:       each,
+    eachSlice:  eachSlice,
+    all:        all,
+    every:      all,
+    any:        any,
+    some:       any,
+    collect:    collect,
+    map:        collect,
+    detect:     detect,
+    findAll:    findAll,
+    select:     findAll,
+    filter:     findAll,
+    grep:       grep,
+    include:    include,
+    member:     include,
+    inGroupsOf: inGroupsOf,
+    inject:     inject,
+    invoke:     invoke,
+    max:        max,
+    min:        min,
+    partition:  partition,
+    pluck:      pluck,
+    reject:     reject,
+    sortBy:     sortBy,
+    toArray:    toArray,
+    entries:    toArray,
+    zip:        zip,
+    size:       size,
+    inspect:    inspect,
+    find:       detect
+  };
+})();
+
 function $A(iterable) {
   if (!iterable) return [];
-  if (iterable.toArray) return iterable.toArray();
+  if ('toArray' in Object(iterable)) return iterable.toArray();
   var length = iterable.length || 0, results = new Array(length);
   while (length--) results[length] = iterable[length];
   return results;
 }
 
-if (Prototype.Browser.WebKit) {
-  $A = function(iterable) {
-    if (!iterable) return [];
-    // In Safari, only use the `toArray` method if it's not a NodeList.
-    // A NodeList is a function, has an function `item` property, and a numeric
-    // `length` property. Adapted from Google Doctype.
-    if (!(typeof iterable === 'function' && typeof iterable.length ===
-        'number' && typeof iterable.item === 'function') && iterable.toArray)
-      return iterable.toArray();
-    var length = iterable.length || 0, results = new Array(length);
-    while (length--) results[length] = iterable[length];
-    return results;
-  };
+
+function $w(string) {
+  if (!Object.isString(string)) return [];
+  string = string.strip();
+  return string ? string.split(/\s+/) : [];
 }
 
 Array.from = $A;
 
-Object.extend(Array.prototype, Enumerable);
 
-if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
+(function() {
+  var arrayProto = Array.prototype,
+      slice = arrayProto.slice,
+      _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available
 
-Object.extend(Array.prototype, {
-  _each: function(iterator) {
-    for (var i = 0, length = this.length; i < length; i++)
-      iterator(this[i]);
-  },
+  function each(iterator, context) {
+    for (var i = 0, length = this.length >>> 0; i < length; i++) {
+      if (i in this) iterator.call(context, this[i], i, this);
+    }
+  }
+  if (!_each) _each = each;
 
-  clear: function() {
+  function clear() {
     this.length = 0;
     return this;
-  },
+  }
 
-  first: function() {
+  function first() {
     return this[0];
-  },
+  }
 
-  last: function() {
+  function last() {
     return this[this.length - 1];
-  },
+  }
 
-  compact: function() {
+  function compact() {
     return this.select(function(value) {
       return value != null;
     });
-  },
+  }
 
-  flatten: function() {
+  function flatten() {
     return this.inject([], function(array, value) {
-      return array.concat(Object.isArray(value) ?
-        value.flatten() : [value]);
+      if (Object.isArray(value))
+        return array.concat(value.flatten());
+      array.push(value);
+      return array;
     });
-  },
+  }
 
-  without: function() {
-    var values = $A(arguments);
+  function without() {
+    var values = slice.call(arguments, 0);
     return this.select(function(value) {
       return !values.include(value);
     });
-  },
-
-  reverse: function(inline) {
-    return (inline !== false ? this : this.toArray())._reverse();
-  },
+  }
 
-  reduce: function() {
-    return this.length > 1 ? this : this[0];
-  },
+  function reverse(inline) {
+    return (inline === false ? this.toArray() : this)._reverse();
+  }
 
-  uniq: function(sorted) {
+  function uniq(sorted) {
     return this.inject([], function(array, value, index) {
       if (0 == index || (sorted ? array.last() != value : !array.include(value)))
         array.push(value);
       return array;
     });
-  },
+  }
 
-  intersect: function(array) {
+  function intersect(array) {
     return this.uniq().findAll(function(item) {
       return array.detect(function(value) { return item === value });
     });
-  },
+  }
 
-  clone: function() {
-    return [].concat(this);
-  },
 
-  size: function() {
+  function clone() {
+    return slice.call(this, 0);
+  }
+
+  function size() {
     return this.length;
-  },
+  }
 
-  inspect: function() {
+  function inspect() {
     return '[' + this.map(Object.inspect).join(', ') + ']';
-  },
-
-  toJSON: function() {
-    var results = [];
-    this.each(function(object) {
-      var value = Object.toJSON(object);
-      if (!Object.isUndefined(value)) results.push(value);
-    });
-    return '[' + results.join(', ') + ']';
   }
-});
-
-// use native browser JS 1.6 implementation if available
-if (Object.isFunction(Array.prototype.forEach))
-  Array.prototype._each = Array.prototype.forEach;
-
-if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
-  i || (i = 0);
-  var length = this.length;
-  if (i < 0) i = length + i;
-  for (; i < length; i++)
-    if (this[i] === item) return i;
-  return -1;
-};
-
-if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
-  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
-  var n = this.slice(0, i).reverse().indexOf(item);
-  return (n < 0) ? n : i - n - 1;
-};
 
-Array.prototype.toArray = Array.prototype.clone;
+  function indexOf(item, i) {
+    i || (i = 0);
+    var length = this.length;
+    if (i < 0) i = length + i;
+    for (; i < length; i++)
+      if (this[i] === item) return i;
+    return -1;
+  }
 
-function $w(string) {
-  if (!Object.isString(string)) return [];
-  string = string.strip();
-  return string ? string.split(/\s+/) : [];
-}
+  function lastIndexOf(item, i) {
+    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
+    var n = this.slice(0, i).reverse().indexOf(item);
+    return (n < 0) ? n : i - n - 1;
+  }
 
-if (Prototype.Browser.Opera){
-  Array.prototype.concat = function() {
-    var array = [];
-    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
+  function concat() {
+    var array = slice.call(this, 0), item;
     for (var i = 0, length = arguments.length; i < length; i++) {
-      if (Object.isArray(arguments[i])) {
-        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
-          array.push(arguments[i][j]);
+      item = arguments[i];
+      if (Object.isArray(item) && !('callee' in item)) {
+        for (var j = 0, arrayLength = item.length; j < arrayLength; j++)
+          array.push(item[j]);
       } else {
-        array.push(arguments[i]);
+        array.push(item);
       }
     }
     return array;
-  };
-}
-Object.extend(Number.prototype, {
-  toColorPart: function() {
-    return this.toPaddedString(2, 16);
-  },
-
-  succ: function() {
-    return this + 1;
-  },
+  }
 
-  times: function(iterator, context) {
-    $R(0, this, true).each(iterator, context);
-    return this;
-  },
+  Object.extend(arrayProto, Enumerable);
+
+  if (!arrayProto._reverse)
+    arrayProto._reverse = arrayProto.reverse;
+
+  Object.extend(arrayProto, {
+    _each:     _each,
+    clear:     clear,
+    first:     first,
+    last:      last,
+    compact:   compact,
+    flatten:   flatten,
+    without:   without,
+    reverse:   reverse,
+    uniq:      uniq,
+    intersect: intersect,
+    clone:     clone,
+    toArray:   clone,
+    size:      size,
+    inspect:   inspect
+  });
 
-  toPaddedString: function(length, radix) {
-    var string = this.toString(radix || 10);
-    return '0'.times(length - string.length) + string;
-  },
+  var CONCAT_ARGUMENTS_BUGGY = (function() {
+    return [].concat(arguments)[0][0] !== 1;
+  })(1,2)
 
-  toJSON: function() {
-    return isFinite(this) ? this.toString() : 'null';
-  }
-});
+  if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;
 
-$w('abs round ceil floor').each(function(method){
-  Number.prototype[method] = Math[method].methodize();
-});
+  if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
+  if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
+})();
 function $H(object) {
   return new Hash(object);
 };
 
 var Hash = Class.create(Enumerable, (function() {
+  function initialize(object) {
+    this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
+  }
 
-  function toQueryPair(key, value) {
-    if (Object.isUndefined(value)) return key;
-    return key + '=' + encodeURIComponent(String.interpret(value));
+
+  function _each(iterator) {
+    for (var key in this._object) {
+      var value = this._object[key], pair = [key, value];
+      pair.key = key;
+      pair.value = value;
+      iterator(pair);
+    }
   }
 
-  return {
-    initialize: function(object) {
-      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
-    },
+  function set(key, value) {
+    return this._object[key] = value;
+  }
 
-    _each: function(iterator) {
-      for (var key in this._object) {
-        var value = this._object[key], pair = [key, value];
-        pair.key = key;
-        pair.value = value;
-        iterator(pair);
-      }
-    },
+  function get(key) {
+    if (this._object[key] !== Object.prototype[key])
+      return this._object[key];
+  }
 
-    set: function(key, value) {
-      return this._object[key] = value;
-    },
+  function unset(key) {
+    var value = this._object[key];
+    delete this._object[key];
+    return value;
+  }
 
-    get: function(key) {
-      // simulating poorly supported hasOwnProperty
-      if (this._object[key] !== Object.prototype[key])
-        return this._object[key];
-    },
+  function toObject() {
+    return Object.clone(this._object);
+  }
 
-    unset: function(key) {
-      var value = this._object[key];
-      delete this._object[key];
-      return value;
-    },
 
-    toObject: function() {
-      return Object.clone(this._object);
-    },
 
-    keys: function() {
-      return this.pluck('key');
-    },
+  function keys() {
+    return this.pluck('key');
+  }
 
-    values: function() {
-      return this.pluck('value');
-    },
+  function values() {
+    return this.pluck('value');
+  }
 
-    index: function(value) {
-      var match = this.detect(function(pair) {
-        return pair.value === value;
-      });
-      return match && match.key;
-    },
+  function index(value) {
+    var match = this.detect(function(pair) {
+      return pair.value === value;
+    });
+    return match && match.key;
+  }
 
-    merge: function(object) {
-      return this.clone().update(object);
-    },
+  function merge(object) {
+    return this.clone().update(object);
+  }
 
-    update: function(object) {
-      return new Hash(object).inject(this, function(result, pair) {
-        result.set(pair.key, pair.value);
-        return result;
-      });
-    },
+  function update(object) {
+    return new Hash(object).inject(this, function(result, pair) {
+      result.set(pair.key, pair.value);
+      return result;
+    });
+  }
 
-    toQueryString: function() {
-      return this.inject([], function(results, pair) {
-        var key = encodeURIComponent(pair.key), values = pair.value;
+  function toQueryPair(key, value) {
+    if (Object.isUndefined(value)) return key;
+    return key + '=' + encodeURIComponent(String.interpret(value));
+  }
 
-        if (values && typeof values == 'object') {
-          if (Object.isArray(values))
-            return results.concat(values.map(toQueryPair.curry(key)));
-        } else results.push(toQueryPair(key, values));
-        return results;
-      }).join('&');
-    },
+  function toQueryString() {
+    return this.inject([], function(results, pair) {
+      var key = encodeURIComponent(pair.key), values = pair.value;
 
-    inspect: function() {
-      return '#<Hash:{' + this.map(function(pair) {
-        return pair.map(Object.inspect).join(': ');
-      }).join(', ') + '}>';
-    },
+      if (values && typeof values == 'object') {
+        if (Object.isArray(values)) {
+          var queryValues = [];
+          for (var i = 0, len = values.length, value; i < len; i++) {
+            value = values[i];
+            queryValues.push(toQueryPair(key, value));
+          }
+          return results.concat(queryValues);
+        }
+      } else results.push(toQueryPair(key, values));
+      return results;
+    }).join('&');
+  }
 
-    toJSON: function() {
-      return Object.toJSON(this.toObject());
-    },
+  function inspect() {
+    return '#<Hash:{' + this.map(function(pair) {
+      return pair.map(Object.inspect).join(': ');
+    }).join(', ') + '}>';
+  }
 
-    clone: function() {
-      return new Hash(this);
-    }
+  function clone() {
+    return new Hash(this);
   }
+
+  return {
+    initialize:             initialize,
+    _each:                  _each,
+    set:                    set,
+    get:                    get,
+    unset:                  unset,
+    toObject:               toObject,
+    toTemplateReplacements: toObject,
+    keys:                   keys,
+    values:                 values,
+    index:                  index,
+    merge:                  merge,
+    update:                 update,
+    toQueryString:          toQueryString,
+    inspect:                inspect,
+    toJSON:                 toObject,
+    clone:                  clone
+  };
 })());
 
-Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
 Hash.from = $H;
-var ObjectRange = Class.create(Enumerable, {
-  initialize: function(start, end, exclusive) {
+Object.extend(Number.prototype, (function() {
+  function toColorPart() {
+    return this.toPaddedString(2, 16);
+  }
+
+  function succ() {
+    return this + 1;
+  }
+
+  function times(iterator, context) {
+    $R(0, this, true).each(iterator, context);
+    return this;
+  }
+
+  function toPaddedString(length, radix) {
+    var string = this.toString(radix || 10);
+    return '0'.times(length - string.length) + string;
+  }
+
+  function abs() {
+    return Math.abs(this);
+  }
+
+  function round() {
+    return Math.round(this);
+  }
+
+  function ceil() {
+    return Math.ceil(this);
+  }
+
+  function floor() {
+    return Math.floor(this);
+  }
+
+  return {
+    toColorPart:    toColorPart,
+    succ:           succ,
+    times:          times,
+    toPaddedString: toPaddedString,
+    abs:            abs,
+    round:          round,
+    ceil:           ceil,
+    floor:          floor
+  };
+})());
+
+function $R(start, end, exclusive) {
+  return new ObjectRange(start, end, exclusive);
+}
+
+var ObjectRange = Class.create(Enumerable, (function() {
+  function initialize(start, end, exclusive) {
     this.start = start;
     this.end = end;
     this.exclusive = exclusive;
-  },
+  }
 
-  _each: function(iterator) {
+  function _each(iterator) {
     var value = this.start;
     while (this.include(value)) {
       iterator(value);
       value = value.succ();
     }
-  },
+  }
 
-  include: function(value) {
+  function include(value) {
     if (value < this.start)
       return false;
     if (this.exclusive)
       return value < this.end;
     return value <= this.end;
   }
-});
 
-var $R = function(start, end, exclusive) {
-  return new ObjectRange(start, end, exclusive);
-};
+  return {
+    initialize: initialize,
+    _each:      _each,
+    include:    include
+  };
+})());
+
+
 
 var Ajax = {
   getTransport: function() {
@@ -1164,7 +1467,6 @@ Ajax.Responders.register({
   onCreate:   function() { Ajax.activeRequestCount++ },
   onComplete: function() { Ajax.activeRequestCount-- }
 });
-
 Ajax.Base = Class.create({
   initialize: function(options) {
     this.options = {
@@ -1180,13 +1482,10 @@ Ajax.Base = Class.create({
 
     this.options.method = this.options.method.toLowerCase();
 
-    if (Object.isString(this.options.parameters))
-      this.options.parameters = this.options.parameters.toQueryParams();
-    else if (Object.isHash(this.options.parameters))
+    if (Object.isHash(this.options.parameters))
       this.options.parameters = this.options.parameters.toObject();
   }
 });
-
 Ajax.Request = Class.create(Ajax.Base, {
   _complete: false,
 
@@ -1199,24 +1498,21 @@ Ajax.Request = Class.create(Ajax.Base, {
   request: function(url) {
     this.url = url;
     this.method = this.options.method;
-    var params = Object.clone(this.options.parameters);
+    var params = Object.isString(this.options.parameters) ?
+          this.options.parameters :
+          Object.toQueryString(this.options.parameters);
 
     if (!['get', 'post'].include(this.method)) {
-      // simulate other verbs over post
-      params['_method'] = this.method;
+      params += (params ? '&' : '') + "_method=" + this.method;
       this.method = 'post';
     }
 
-    this.parameters = params;
-
-    if (params = Object.toQueryString(params)) {
-      // when GET, append parameters to URL
-      if (this.method == 'get')
-        this.url += (this.url.include('?') ? '&' : '?') + params;
-      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
-        params += '&_=';
+    if (params && this.method === 'get') {
+      this.url += (this.url.include('?') ? '&' : '?') + params;
     }
 
+    this.parameters = params.toQueryParams();
+
     try {
       var response = new Ajax.Response(this);
       if (this.options.onCreate) this.options.onCreate(response);
@@ -1269,7 +1565,6 @@ Ajax.Request = Class.create(Ajax.Base, {
             headers['Connection'] = 'close';
     }
 
-    // user-defined headers
     if (typeof this.options.requestHeaders == 'object') {
       var extras = this.options.requestHeaders;
 
@@ -1286,11 +1581,12 @@ Ajax.Request = Class.create(Ajax.Base, {
 
   success: function() {
     var status = this.getStatus();
-    return !status || (status >= 200 && status < 300);
+    return !status || (status >= 200 && status < 300) || status == 304;
   },
 
   getStatus: function() {
     try {
+      if (this.transport.status === 1223) return 204;
       return this.transport.status || 0;
     } catch (e) { return 0 }
   },
@@ -1323,7 +1619,6 @@ Ajax.Request = Class.create(Ajax.Base, {
     }
 
     if (state == 'Complete') {
-      // avoid memory leak in MSIE: clean up
       this.transport.onreadystatechange = Prototype.emptyFunction;
     }
   },
@@ -1340,7 +1635,7 @@ Ajax.Request = Class.create(Ajax.Base, {
   getHeader: function(name) {
     try {
       return this.transport.getResponseHeader(name) || null;
-    } catch (e) { return null }
+    } catch (e) { return null; }
   },
 
   evalResponse: function() {
@@ -1360,20 +1655,27 @@ Ajax.Request = Class.create(Ajax.Base, {
 Ajax.Request.Events =
   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
 
+
+
+
+
+
+
+
 Ajax.Response = Class.create({
   initialize: function(request){
     this.request = request;
     var transport  = this.transport  = request.transport,
         readyState = this.readyState = transport.readyState;
 
-    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
+    if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
       this.status       = this.getStatus();
       this.statusText   = this.getStatusText();
       this.responseText = String.interpret(transport.responseText);
       this.headerJSON   = this._getHeaderJSON();
     }
 
-    if(readyState == 4) {
+    if (readyState == 4) {
       var xml = transport.responseXML;
       this.responseXML  = Object.isUndefined(xml) ? null : xml;
       this.responseJSON = this._getResponseJSON();
@@ -1381,6 +1683,7 @@ Ajax.Response = Class.create({
   },
 
   status:      0,
+
   statusText: '',
 
   getStatus: Ajax.Request.prototype.getStatus,
@@ -1510,6 +1813,8 @@ Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
     this.updater = new Ajax.Updater(this.container, this.url, this.options);
   }
 });
+
+
 function $(element) {
   if (arguments.length > 1) {
     for (var i = 0, elements = [], length = arguments.length; i < length; i++)
@@ -1534,10 +1839,9 @@ if (Prototype.BrowserFeatures.XPath) {
 
 /*--------------------------------------------------------------------------*/
 
-if (!window.Node) var Node = { };
+if (!Node) var Node = { };
 
 if (!Node.ELEMENT_NODE) {
-  // DOM level 2 ECMAScript Language Binding
   Object.extend(Node, {
     ELEMENT_NODE: 1,
     ATTRIBUTE_NODE: 2,
@@ -1554,26 +1858,63 @@ if (!Node.ELEMENT_NODE) {
   });
 }
 
-(function() {
-  var element = this.Element;
-  this.Element = function(tagName, attributes) {
+
+
+(function(global) {
+  function shouldUseCache(tagName, attributes) {
+    if (tagName === 'select') return false;
+    if ('type' in attributes) return false;
+    return true;
+  }
+
+  var HAS_EXTENDED_CREATE_ELEMENT_SYNTAX = (function(){
+    try {
+      var el = document.createElement('<input name="x">');
+      return el.tagName.toLowerCase() === 'input' && el.name === 'x';
+    }
+    catch(err) {
+      return false;
+    }
+  })();
+
+  var element = global.Element;
+
+  global.Element = function(tagName, attributes) {
     attributes = attributes || { };
     tagName = tagName.toLowerCase();
     var cache = Element.cache;
-    if (Prototype.Browser.IE && attributes.name) {
+
+    if (HAS_EXTENDED_CREATE_ELEMENT_SYNTAX && attributes.name) {
       tagName = '<' + tagName + ' name="' + attributes.name + '">';
       delete attributes.name;
       return Element.writeAttribute(document.createElement(tagName), attributes);
     }
+
     if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
-    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
+
+    var node = shouldUseCache(tagName, attributes) ?
+     cache[tagName].cloneNode(false) : document.createElement(tagName);
+
+    return Element.writeAttribute(node, attributes);
   };
-  Object.extend(this.Element, element || { });
-  if (element) this.Element.prototype = element.prototype;
-}).call(window);
 
+  Object.extend(global.Element, element || { });
+  if (element) global.Element.prototype = element.prototype;
+
+})(this);
+
+Element.idCounter = 1;
 Element.cache = { };
 
+Element._purgeElement = function(element) {
+  var uid = element._prototypeUID;
+  if (uid) {
+    Element.stopObserving(element);
+    element._prototypeUID = void 0;
+    delete Element.Storage[uid];
+  }
+}
+
 Element.Methods = {
   visible: function(element) {
     return $(element).style.display != 'none';
@@ -1603,15 +1944,116 @@ Element.Methods = {
     return element;
   },
 
-  update: function(element, content) {
-    element = $(element);
-    if (content && content.toElement) content = content.toElement();
-    if (Object.isElement(content)) return element.update().insert(content);
-    content = Object.toHTML(content);
-    element.innerHTML = content.stripScripts();
-    content.evalScripts.bind(content).defer();
-    return element;
-  },
+  update: (function(){
+
+    var SELECT_ELEMENT_INNERHTML_BUGGY = (function(){
+      var el = document.createElement("select"),
+          isBuggy = true;
+      el.innerHTML = "<option value=\"test\">test</option>";
+      if (el.options && el.options[0]) {
+        isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
+      }
+      el = null;
+      return isBuggy;
+    })();
+
+    var TABLE_ELEMENT_INNERHTML_BUGGY = (function(){
+      try {
+        var el = document.createElement("table");
+        if (el && el.tBodies) {
+          el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
+          var isBuggy = typeof el.tBodies[0] == "undefined";
+          el = null;
+          return isBuggy;
+        }
+      } catch (e) {
+        return true;
+      }
+    })();
+
+    var LINK_ELEMENT_INNERHTML_BUGGY = (function() {
+      try {
+        var el = document.createElement('div');
+        el.innerHTML = "<link>";
+        var isBuggy = (el.childNodes.length === 0);
+        el = null;
+        return isBuggy;
+      } catch(e) {
+        return true;
+      }
+    })();
+
+    var ANY_INNERHTML_BUGGY = SELECT_ELEMENT_INNERHTML_BUGGY ||
+     TABLE_ELEMENT_INNERHTML_BUGGY || LINK_ELEMENT_INNERHTML_BUGGY;
+
+    var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
+      var s = document.createElement("script"),
+          isBuggy = false;
+      try {
+        s.appendChild(document.createTextNode(""));
+        isBuggy = !s.firstChild ||
+          s.firstChild && s.firstChild.nodeType !== 3;
+      } catch (e) {
+        isBuggy = true;
+      }
+      s = null;
+      return isBuggy;
+    })();
+
+
+    function update(element, content) {
+      element = $(element);
+      var purgeElement = Element._purgeElement;
+
+      var descendants = element.getElementsByTagName('*'),
+       i = descendants.length;
+      while (i--) purgeElement(descendants[i]);
+
+      if (content && content.toElement)
+        content = content.toElement();
+
+      if (Object.isElement(content))
+        return element.update().insert(content);
+
+      content = Object.toHTML(content);
+
+      var tagName = element.tagName.toUpperCase();
+
+      if (tagName === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
+        element.text = content;
+        return element;
+      }
+
+      if (ANY_INNERHTML_BUGGY) {
+        if (tagName in Element._insertionTranslations.tags) {
+          while (element.firstChild) {
+            element.removeChild(element.firstChild);
+          }
+          Element._getContentFromAnonymousElement(tagName, content.stripScripts())
+            .each(function(node) {
+              element.appendChild(node)
+            });
+        } else if (LINK_ELEMENT_INNERHTML_BUGGY && Object.isString(content) && content.indexOf('<link') > -1) {
+          while (element.firstChild) {
+            element.removeChild(element.firstChild);
+          }
+          var nodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts(), true);
+          nodes.each(function(node) { element.appendChild(node) });
+        }
+        else {
+          element.innerHTML = content.stripScripts();
+        }
+      }
+      else {
+        element.innerHTML = content.stripScripts();
+      }
+
+      content.evalScripts.bind(content).defer();
+      return element;
+    }
+
+    return update;
+  })(),
 
   replace: function(element, content) {
     element = $(element);
@@ -1679,28 +2121,35 @@ Element.Methods = {
     element = $(element);
     var result = '<' + element.tagName.toLowerCase();
     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
-      var property = pair.first(), attribute = pair.last();
-      var value = (element[property] || '').toString();
+      var property = pair.first(),
+          attribute = pair.last(),
+          value = (element[property] || '').toString();
       if (value) result += ' ' + attribute + '=' + value.inspect(true);
     });
     return result + '>';
   },
 
-  recursivelyCollect: function(element, property) {
+  recursivelyCollect: function(element, property, maximumLength) {
     element = $(element);
+    maximumLength = maximumLength || -1;
     var elements = [];
-    while (element = element[property])
+
+    while (element = element[property]) {
       if (element.nodeType == 1)
         elements.push(Element.extend(element));
+      if (elements.length == maximumLength)
+        break;
+    }
+
     return elements;
   },
 
   ancestors: function(element) {
-    return $(element).recursivelyCollect('parentNode');
+    return Element.recursivelyCollect(element, 'parentNode');
   },
 
   descendants: function(element) {
-    return $(element).select("*");
+    return Element.select(element, "*");
   },
 
   firstDescendant: function(element) {
@@ -1710,78 +2159,96 @@ Element.Methods = {
   },
 
   immediateDescendants: function(element) {
-    if (!(element = $(element).firstChild)) return [];
-    while (element && element.nodeType != 1) element = element.nextSibling;
-    if (element) return [element].concat($(element).nextSiblings());
-    return [];
+    var results = [], child = $(element).firstChild;
+    while (child) {
+      if (child.nodeType === 1) {
+        results.push(Element.extend(child));
+      }
+      child = child.nextSibling;
+    }
+    return results;
   },
 
-  previousSiblings: function(element) {
-    return $(element).recursivelyCollect('previousSibling');
+  previousSiblings: function(element, maximumLength) {
+    return Element.recursivelyCollect(element, 'previousSibling');
   },
 
   nextSiblings: function(element) {
-    return $(element).recursivelyCollect('nextSibling');
+    return Element.recursivelyCollect(element, 'nextSibling');
   },
 
   siblings: function(element) {
     element = $(element);
-    return element.previousSiblings().reverse().concat(element.nextSiblings());
+    return Element.previousSiblings(element).reverse()
+      .concat(Element.nextSiblings(element));
   },
 
   match: function(element, selector) {
+    element = $(element);
     if (Object.isString(selector))
-      selector = new Selector(selector);
-    return selector.match($(element));
+      return Prototype.Selector.match(element, selector);
+    return selector.match(element);
   },
 
   up: function(element, expression, index) {
     element = $(element);
     if (arguments.length == 1) return $(element.parentNode);
-    var ancestors = element.ancestors();
+    var ancestors = Element.ancestors(element);
     return Object.isNumber(expression) ? ancestors[expression] :
-      Selector.findElement(ancestors, expression, index);
+      Prototype.Selector.find(ancestors, expression, index);
   },
 
   down: function(element, expression, index) {
     element = $(element);
-    if (arguments.length == 1) return element.firstDescendant();
-    return Object.isNumber(expression) ? element.descendants()[expression] :
+    if (arguments.length == 1) return Element.firstDescendant(element);
+    return Object.isNumber(expression) ? Element.descendants(element)[expression] :
       Element.select(element, expression)[index || 0];
   },
 
   previous: function(element, expression, index) {
     element = $(element);
-    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
-    var previousSiblings = element.previousSiblings();
-    return Object.isNumber(expression) ? previousSiblings[expression] :
-      Selector.findElement(previousSiblings, expression, index);
+    if (Object.isNumber(expression)) index = expression, expression = false;
+    if (!Object.isNumber(index)) index = 0;
+
+    if (expression) {
+      return Prototype.Selector.find(element.previousSiblings(), expression, index);
+    } else {
+      return element.recursivelyCollect("previousSibling", index + 1)[index];
+    }
   },
 
   next: function(element, expression, index) {
     element = $(element);
-    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
-    var nextSiblings = element.nextSiblings();
-    return Object.isNumber(expression) ? nextSiblings[expression] :
-      Selector.findElement(nextSiblings, expression, index);
+    if (Object.isNumber(expression)) index = expression, expression = false;
+    if (!Object.isNumber(index)) index = 0;
+
+    if (expression) {
+      return Prototype.Selector.find(element.nextSiblings(), expression, index);
+    } else {
+      var maximumLength = Object.isNumber(index) ? index + 1 : 1;
+      return element.recursivelyCollect("nextSibling", index + 1)[index];
+    }
   },
 
-  select: function() {
-    var args = $A(arguments), element = $(args.shift());
-    return Selector.findChildElements(element, args);
+
+  select: function(element) {
+    element = $(element);
+    var expressions = Array.prototype.slice.call(arguments, 1).join(', ');
+    return Prototype.Selector.select(expressions, element);
   },
 
-  adjacent: function() {
-    var args = $A(arguments), element = $(args.shift());
-    return Selector.findChildElements(element.parentNode, args).without(element);
+  adjacent: function(element) {
+    element = $(element);
+    var expressions = Array.prototype.slice.call(arguments, 1).join(', ');
+    return Prototype.Selector.select(expressions, element.parentNode).without(element);
   },
 
   identify: function(element) {
     element = $(element);
-    var id = element.readAttribute('id'), self = arguments.callee;
+    var id = Element.readAttribute(element, 'id');
     if (id) return id;
-    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
-    element.writeAttribute('id', id);
+    do { id = 'anonymous_element_' + Element.idCounter++ } while ($(id));
+    Element.writeAttribute(element, 'id', id);
     return id;
   },
 
@@ -1820,11 +2287,11 @@ Element.Methods = {
   },
 
   getHeight: function(element) {
-    return $(element).getDimensions().height;
+    return Element.getDimensions(element).height;
   },
 
   getWidth: function(element) {
-    return $(element).getDimensions().width;
+    return Element.getDimensions(element).width;
   },
 
   classNames: function(element) {
@@ -1840,7 +2307,7 @@ Element.Methods = {
 
   addClassName: function(element, className) {
     if (!(element = $(element))) return;
-    if (!element.hasClassName(className))
+    if (!Element.hasClassName(element, className))
       element.className += (element.className ? ' ' : '') + className;
     return element;
   },
@@ -1854,11 +2321,10 @@ Element.Methods = {
 
   toggleClassName: function(element, className) {
     if (!(element = $(element))) return;
-    return element[element.hasClassName(className) ?
-      'removeClassName' : 'addClassName'](className);
+    return Element[Element.hasClassName(element, className) ?
+      'removeClassName' : 'addClassName'](element, className);
   },
 
-  // removes whitespace-only text node children
   cleanWhitespace: function(element) {
     element = $(element);
     var node = element.firstChild;
@@ -1892,7 +2358,7 @@ Element.Methods = {
 
   scrollTo: function(element) {
     element = $(element);
-    var pos = element.cumulativeOffset();
+    var pos = Element.cumulativeOffset(element);
     window.scrollTo(pos[0], pos[1]);
     return element;
   },
@@ -1938,37 +2404,12 @@ Element.Methods = {
     return element;
   },
 
-  getDimensions: function(element) {
-    element = $(element);
-    var display = element.getStyle('display');
-    if (display != 'none' && display != null) // Safari bug
-      return {width: element.offsetWidth, height: element.offsetHeight};
-
-    // All *Width and *Height properties give 0 on elements with display none,
-    // so enable the element temporarily
-    var els = element.style;
-    var originalVisibility = els.visibility;
-    var originalPosition = els.position;
-    var originalDisplay = els.display;
-    els.visibility = 'hidden';
-    els.position = 'absolute';
-    els.display = 'block';
-    var originalWidth = element.clientWidth;
-    var originalHeight = element.clientHeight;
-    els.display = originalDisplay;
-    els.position = originalPosition;
-    els.visibility = originalVisibility;
-    return {width: originalWidth, height: originalHeight};
-  },
-
   makePositioned: function(element) {
     element = $(element);
     var pos = Element.getStyle(element, 'position');
     if (pos == 'static' || !pos) {
       element._madePositioned = true;
       element.style.position = 'relative';
-      // Opera returns the offset relative to the positioning context, when an
-      // element is position relative but top and left have not been defined
       if (Prototype.Browser.Opera) {
         element.style.top = 0;
         element.style.left = 0;
@@ -2007,117 +2448,6 @@ Element.Methods = {
     return element;
   },
 
-  cumulativeOffset: function(element) {
-    var valueT = 0, valueL = 0;
-    do {
-      valueT += element.offsetTop  || 0;
-      valueL += element.offsetLeft || 0;
-      element = element.offsetParent;
-    } while (element);
-    return Element._returnOffset(valueL, valueT);
-  },
-
-  positionedOffset: function(element) {
-    var valueT = 0, valueL = 0;
-    do {
-      valueT += element.offsetTop  || 0;
-      valueL += element.offsetLeft || 0;
-      element = element.offsetParent;
-      if (element) {
-        if (element.tagName.toUpperCase() == 'BODY') break;
-        var p = Element.getStyle(element, 'position');
-        if (p !== 'static') break;
-      }
-    } while (element);
-    return Element._returnOffset(valueL, valueT);
-  },
-
-  absolutize: function(element) {
-    element = $(element);
-    if (element.getStyle('position') == 'absolute') return element;
-    // Position.prepare(); // To be done manually by Scripty when it needs it.
-
-    var offsets = element.positionedOffset();
-    var top     = offsets[1];
-    var left    = offsets[0];
-    var width   = element.clientWidth;
-    var height  = element.clientHeight;
-
-    element._originalLeft   = left - parseFloat(element.style.left  || 0);
-    element._originalTop    = top  - parseFloat(element.style.top || 0);
-    element._originalWidth  = element.style.width;
-    element._originalHeight = element.style.height;
-
-    element.style.position = 'absolute';
-    element.style.top    = top + 'px';
-    element.style.left   = left + 'px';
-    element.style.width  = width + 'px';
-    element.style.height = height + 'px';
-    return element;
-  },
-
-  relativize: function(element) {
-    element = $(element);
-    if (element.getStyle('position') == 'relative') return element;
-    // Position.prepare(); // To be done manually by Scripty when it needs it.
-
-    element.style.position = 'relative';
-    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
-    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
-
-    element.style.top    = top + 'px';
-    element.style.left   = left + 'px';
-    element.style.height = element._originalHeight;
-    element.style.width  = element._originalWidth;
-    return element;
-  },
-
-  cumulativeScrollOffset: function(element) {
-    var valueT = 0, valueL = 0;
-    do {
-      valueT += element.scrollTop  || 0;
-      valueL += element.scrollLeft || 0;
-      element = element.parentNode;
-    } while (element);
-    return Element._returnOffset(valueL, valueT);
-  },
-
-  getOffsetParent: function(element) {
-    if (element.offsetParent) return $(element.offsetParent);
-    if (element == document.body) return $(element);
-
-    while ((element = element.parentNode) && element != document.body)
-      if (Element.getStyle(element, 'position') != 'static')
-        return $(element);
-
-    return $(document.body);
-  },
-
-  viewportOffset: function(forElement) {
-    var valueT = 0, valueL = 0;
-
-    var element = forElement;
-    do {
-      valueT += element.offsetTop  || 0;
-      valueL += element.offsetLeft || 0;
-
-      // Safari fix
-      if (element.offsetParent == document.body &&
-        Element.getStyle(element, 'position') == 'absolute') break;
-
-    } while (element = element.offsetParent);
-
-    element = forElement;
-    do {
-      if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
-        valueT -= element.scrollTop  || 0;
-        valueL -= element.scrollLeft || 0;
-      }
-    } while (element = element.parentNode);
-
-    return Element._returnOffset(valueL, valueT);
-  },
-
   clonePosition: function(element, source) {
     var options = Object.extend({
       setLeft:    true,
@@ -2128,28 +2458,21 @@ Element.Methods = {
       offsetLeft: 0
     }, arguments[2] || { });
 
-    // find page position of source
     source = $(source);
-    var p = source.viewportOffset();
+    var p = Element.viewportOffset(source), delta = [0, 0], parent = null;
 
-    // find coordinate system to use
     element = $(element);
-    var delta = [0, 0];
-    var parent = null;
-    // delta [0,0] will do fine with position: fixed elements,
-    // position:absolute needs offsetParent deltas
+
     if (Element.getStyle(element, 'position') == 'absolute') {
-      parent = element.getOffsetParent();
-      delta = parent.viewportOffset();
+      parent = Element.getOffsetParent(element);
+      delta = Element.viewportOffset(parent);
     }
 
-    // correct by body offsets (fixes Safari)
     if (parent == document.body) {
       delta[0] -= document.body.offsetLeft;
       delta[1] -= document.body.offsetTop;
     }
 
-    // set position
     if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
     if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
     if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
@@ -2158,10 +2481,9 @@ Element.Methods = {
   }
 };
 
-Element.Methods.identify.counter = 1;
-
 Object.extend(Element.Methods, {
   getElementsBySelector: Element.Methods.select,
+
   childElements: Element.Methods.immediateDescendants
 });
 
@@ -2179,14 +2501,9 @@ if (Prototype.Browser.Opera) {
   Element.Methods.getStyle = Element.Methods.getStyle.wrap(
     function(proceed, element, style) {
       switch (style) {
-        case 'left': case 'top': case 'right': case 'bottom':
-          if (proceed(element, 'position') === 'static') return null;
         case 'height': case 'width':
-          // returns '0px' for hidden elements; we want it to return null
           if (!Element.visible(element)) return null;
 
-          // returns the border-box dimensions rather than the content-box
-          // dimensions, so we subtract padding and borders from the value
           var dim = parseInt(proceed(element, style), 10);
 
           if (dim !== element['offset' + style.capitalize()])
@@ -2219,52 +2536,6 @@ if (Prototype.Browser.Opera) {
 }
 
 else if (Prototype.Browser.IE) {
-  // IE doesn't report offsets correctly for static elements, so we change them
-  // to "relative" to get the values, then change them back.
-  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
-    function(proceed, element) {
-      element = $(element);
-      // IE throws an error if element is not in document
-      try { element.offsetParent }
-      catch(e) { return $(document.body) }
-      var position = element.getStyle('position');
-      if (position !== 'static') return proceed(element);
-      element.setStyle({ position: 'relative' });
-      var value = proceed(element);
-      element.setStyle({ position: position });
-      return value;
-    }
-  );
-
-  $w('positionedOffset viewportOffset').each(function(method) {
-    Element.Methods[method] = Element.Methods[method].wrap(
-      function(proceed, element) {
-        element = $(element);
-        try { element.offsetParent }
-        catch(e) { return Element._returnOffset(0,0) }
-        var position = element.getStyle('position');
-        if (position !== 'static') return proceed(element);
-        // Trigger hasLayout on the offset parent so that IE6 reports
-        // accurate offsetTop and offsetLeft values for position: fixed.
-        var offsetParent = element.getOffsetParent();
-        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
-          offsetParent.setStyle({ zoom: 1 });
-        element.setStyle({ position: 'relative' });
-        var value = proceed(element);
-        element.setStyle({ position: position });
-        return value;
-      }
-    );
-  });
-
-  Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
-    function(proceed, element) {
-      try { element.offsetParent }
-      catch(e) { return Element._returnOffset(0,0) }
-      return proceed(element);
-    }
-  );
-
   Element.Methods.getStyle = function(element, style) {
     element = $(element);
     style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
@@ -2306,36 +2577,90 @@ else if (Prototype.Browser.IE) {
     return element;
   };
 
-  Element._attributeTranslations = {
-    read: {
-      names: {
-        'class': 'className',
-        'for':   'htmlFor'
-      },
-      values: {
-        _getAttr: function(element, attribute) {
-          return element.getAttribute(attribute, 2);
-        },
-        _getAttrNode: function(element, attribute) {
-          var node = element.getAttributeNode(attribute);
-          return node ? node.value : "";
-        },
-        _getEv: function(element, attribute) {
-          attribute = element.getAttribute(attribute);
-          return attribute ? attribute.toString().slice(23, -2) : null;
-        },
-        _flag: function(element, attribute) {
-          return $(element).hasAttribute(attribute) ? attribute : null;
-        },
-        style: function(element) {
-          return element.style.cssText.toLowerCase();
+  Element._attributeTranslations = (function(){
+
+    var classProp = 'className',
+        forProp = 'for',
+        el = document.createElement('div');
+
+    el.setAttribute(classProp, 'x');
+
+    if (el.className !== 'x') {
+      el.setAttribute('class', 'x');
+      if (el.className === 'x') {
+        classProp = 'class';
+      }
+    }
+    el = null;
+
+    el = document.createElement('label');
+    el.setAttribute(forProp, 'x');
+    if (el.htmlFor !== 'x') {
+      el.setAttribute('htmlFor', 'x');
+      if (el.htmlFor === 'x') {
+        forProp = 'htmlFor';
+      }
+    }
+    el = null;
+
+    return {
+      read: {
+        names: {
+          'class':      classProp,
+          'className':  classProp,
+          'for':        forProp,
+          'htmlFor':    forProp
         },
-        title: function(element) {
-          return element.title;
+        values: {
+          _getAttr: function(element, attribute) {
+            return element.getAttribute(attribute);
+          },
+          _getAttr2: function(element, attribute) {
+            return element.getAttribute(attribute, 2);
+          },
+          _getAttrNode: function(element, attribute) {
+            var node = element.getAttributeNode(attribute);
+            return node ? node.value : "";
+          },
+          _getEv: (function(){
+
+            var el = document.createElement('div'), f;
+            el.onclick = Prototype.emptyFunction;
+            var value = el.getAttribute('onclick');
+
+            if (String(value).indexOf('{') > -1) {
+              f = function(element, attribute) {
+                attribute = element.getAttribute(attribute);
+                if (!attribute) return null;
+                attribute = attribute.toString();
+                attribute = attribute.split('{')[1];
+                attribute = attribute.split('}')[0];
+                return attribute.strip();
+              };
+            }
+            else if (value === '') {
+              f = function(element, attribute) {
+                attribute = element.getAttribute(attribute);
+                if (!attribute) return null;
+                return attribute.strip();
+              };
+            }
+            el = null;
+            return f;
+          })(),
+          _flag: function(element, attribute) {
+            return $(element).hasAttribute(attribute) ? attribute : null;
+          },
+          style: function(element) {
+            return element.style.cssText.toLowerCase();
+          },
+          title: function(element) {
+            return element.title;
+          }
         }
       }
     }
-  };
+  })();
 
   Element._attributeTranslations.write = {
     names: Object.extend({
@@ -2363,8 +2688,8 @@ else if (Prototype.Browser.IE) {
 
   (function(v) {
     Object.extend(v, {
-      href:        v._getAttr,
-      src:         v._getAttr,
+      href:        v._getAttr2,
+      src:         v._getAttr2,
       type:        v._getAttr,
       action:      v._getAttrNode,
       disabled:    v._flag,
@@ -2391,6 +2716,26 @@ else if (Prototype.Browser.IE) {
       onchange:    v._getEv
     });
   })(Element._attributeTranslations.read.values);
+
+  if (Prototype.BrowserFeatures.ElementExtensions) {
+    (function() {
+      function _descendants(element) {
+        var nodes = element.getElementsByTagName('*'), results = [];
+        for (var i = 0, node; node = nodes[i]; i++)
+          if (node.tagName !== "!") // Filter out comment nodes.
+            results.push(node);
+        return results;
+      }
+
+      Element.Methods.down = function(element, expression, index) {
+        element = $(element);
+        if (arguments.length == 1) return element.firstDescendant();
+        return Object.isNumber(expression) ? _descendants(element)[expression] :
+          Element.select(element, expression)[index || 0];
+      }
+    })();
+  }
+
 }
 
 else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
@@ -2409,7 +2754,7 @@ else if (Prototype.Browser.WebKit) {
       (value < 0.00001) ? 0 : value;
 
     if (value == 1)
-      if(element.tagName.toUpperCase() == 'IMG' && element.width) {
+      if (element.tagName.toUpperCase() == 'IMG' && element.width) {
         element.width++; element.width--;
       } else try {
         var n = document.createTextNode(' ');
@@ -2419,49 +2764,9 @@ else if (Prototype.Browser.WebKit) {
 
     return element;
   };
-
-  // Safari returns margins on body which is incorrect if the child is absolutely
-  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
-  // KHTML/WebKit only.
-  Element.Methods.cumulativeOffset = function(element) {
-    var valueT = 0, valueL = 0;
-    do {
-      valueT += element.offsetTop  || 0;
-      valueL += element.offsetLeft || 0;
-      if (element.offsetParent == document.body)
-        if (Element.getStyle(element, 'position') == 'absolute') break;
-
-      element = element.offsetParent;
-    } while (element);
-
-    return Element._returnOffset(valueL, valueT);
-  };
-}
-
-if (Prototype.Browser.IE || Prototype.Browser.Opera) {
-  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
-  Element.Methods.update = function(element, content) {
-    element = $(element);
-
-    if (content && content.toElement) content = content.toElement();
-    if (Object.isElement(content)) return element.update().insert(content);
-
-    content = Object.toHTML(content);
-    var tagName = element.tagName.toUpperCase();
-
-    if (tagName in Element._insertionTranslations.tags) {
-      $A(element.childNodes).each(function(node) { element.removeChild(node) });
-      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
-        .each(function(node) { element.appendChild(node) });
-    }
-    else element.innerHTML = content.stripScripts();
-
-    content.evalScripts.bind(content).defer();
-    return element;
-  };
 }
 
-if ('outerHTML' in document.createElement('div')) {
+if ('outerHTML' in document.documentElement) {
   Element.Methods.replace = function(element, content) {
     element = $(element);
 
@@ -2475,8 +2780,8 @@ if ('outerHTML' in document.createElement('div')) {
     var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
 
     if (Element._insertionTranslations.tags[tagName]) {
-      var nextSibling = element.next();
-      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
+      var nextSibling = element.next(),
+          fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
       parent.removeChild(element);
       if (nextSibling)
         fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
@@ -2497,12 +2802,27 @@ Element._returnOffset = function(l, t) {
   return result;
 };
 
-Element._getContentFromAnonymousElement = function(tagName, html) {
-  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
-  if (t) {
-    div.innerHTML = t[0] + html + t[1];
-    t[2].times(function() { div = div.firstChild });
-  } else div.innerHTML = html;
+Element._getContentFromAnonymousElement = function(tagName, html, force) {
+  var div = new Element('div'),
+      t = Element._insertionTranslations.tags[tagName];
+
+  var workaround = false;
+  if (t) workaround = true;
+  else if (force) {
+    workaround = true;
+    t = ['', '', 0];
+  }
+
+  if (workaround) {
+    div.innerHTML = '&nbsp;' + t[0] + html + t[1];
+    div.removeChild(div.firstChild);
+    for (var i = t[2]; i--; ) {
+      div = div.firstChild;
+    }
+  }
+  else {
+    div.innerHTML = html;
+  }
   return $A(div.childNodes);
 };
 
@@ -2529,12 +2849,13 @@ Element._insertionTranslations = {
 };
 
 (function() {
-  Object.extend(this.tags, {
-    THEAD: this.tags.TBODY,
-    TFOOT: this.tags.TBODY,
-    TH:    this.tags.TD
+  var tags = Element._insertionTranslations.tags;
+  Object.extend(tags, {
+    THEAD: tags.TBODY,
+    TFOOT: tags.TBODY,
+    TH:    tags.TD
   });
-}).call(Element._insertionTranslations);
+})();
 
 Element.Methods.Simulated = {
   hasAttribute: function(element, attribute) {
@@ -2548,41 +2869,81 @@ Element.Methods.ByTag = { };
 
 Object.extend(Element, Element.Methods);
 
-if (!Prototype.BrowserFeatures.ElementExtensions &&
-    document.createElement('div')['__proto__']) {
-  window.HTMLElement = { };
-  window.HTMLElement.prototype = document.createElement('div')['__proto__'];
-  Prototype.BrowserFeatures.ElementExtensions = true;
-}
+(function(div) {
+
+  if (!Prototype.BrowserFeatures.ElementExtensions && div['__proto__']) {
+    window.HTMLElement = { };
+    window.HTMLElement.prototype = div['__proto__'];
+    Prototype.BrowserFeatures.ElementExtensions = true;
+  }
+
+  div = null;
+
+})(document.createElement('div'));
 
 Element.extend = (function() {
-  if (Prototype.BrowserFeatures.SpecificElementExtensions)
+
+  function checkDeficiency(tagName) {
+    if (typeof window.Element != 'undefined') {
+      var proto = window.Element.prototype;
+      if (proto) {
+        var id = '_' + (Math.random()+'').slice(2),
+            el = document.createElement(tagName);
+        proto[id] = 'x';
+        var isBuggy = (el[id] !== 'x');
+        delete proto[id];
+        el = null;
+        return isBuggy;
+      }
+    }
+    return false;
+  }
+
+  function extendElementWith(element, methods) {
+    for (var property in methods) {
+      var value = methods[property];
+      if (Object.isFunction(value) && !(property in element))
+        element[property] = value.methodize();
+    }
+  }
+
+  var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY = checkDeficiency('object');
+
+  if (Prototype.BrowserFeatures.SpecificElementExtensions) {
+    if (HTMLOBJECTELEMENT_PROTOTYPE_BUGGY) {
+      return function(element) {
+        if (element && typeof element._extendedByPrototype == 'undefined') {
+          var t = element.tagName;
+          if (t && (/^(?:object|applet|embed)$/i.test(t))) {
+            extendElementWith(element, Element.Methods);
+            extendElementWith(element, Element.Methods.Simulated);
+            extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
+          }
+        }
+        return element;
+      }
+    }
     return Prototype.K;
+  }
 
   var Methods = { }, ByTag = Element.Methods.ByTag;
 
   var extend = Object.extend(function(element) {
-    if (!element || element._extendedByPrototype ||
+    if (!element || typeof element._extendedByPrototype != 'undefined' ||
         element.nodeType != 1 || element == window) return element;
 
     var methods = Object.clone(Methods),
-      tagName = element.tagName.toUpperCase(), property, value;
+        tagName = element.tagName.toUpperCase();
 
-    // extend methods for specific tags
     if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
 
-    for (property in methods) {
-      value = methods[property];
-      if (Object.isFunction(value) && !(property in element))
-        element[property] = value.methodize();
-    }
+    extendElementWith(element, methods);
 
     element._extendedByPrototype = Prototype.emptyFunction;
     return element;
 
   }, {
     refresh: function() {
-      // extend methods for all tags (Safari doesn't need this)
       if (!Prototype.BrowserFeatures.ElementExtensions) {
         Object.extend(Methods, Element.Methods);
         Object.extend(Methods, Element.Methods.Simulated);
@@ -2594,10 +2955,14 @@ Element.extend = (function() {
   return extend;
 })();
 
-Element.hasAttribute = function(element, attribute) {
-  if (element.hasAttribute) return element.hasAttribute(attribute);
-  return Element.Methods.Simulated.hasAttribute(element, attribute);
-};
+if (document.documentElement.hasAttribute) {
+  Element.hasAttribute = function(element, attribute) {
+    return element.hasAttribute(attribute);
+  };
+}
+else {
+  Element.hasAttribute = Element.Methods.Simulated.hasAttribute;
+}
 
 Element.addMethods = function(methods) {
   var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
@@ -2609,7 +2974,8 @@ Element.addMethods = function(methods) {
       "FORM":     Object.clone(Form.Methods),
       "INPUT":    Object.clone(Form.Element.Methods),
       "SELECT":   Object.clone(Form.Element.Methods),
-      "TEXTAREA": Object.clone(Form.Element.Methods)
+      "TEXTAREA": Object.clone(Form.Element.Methods),
+      "BUTTON":   Object.clone(Form.Element.Methods)
     });
   }
 
@@ -2661,14 +3027,19 @@ Element.addMethods = function(methods) {
     klass = 'HTML' + tagName.capitalize() + 'Element';
     if (window[klass]) return window[klass];
 
-    window[klass] = { };
-    window[klass].prototype = document.createElement(tagName)['__proto__'];
-    return window[klass];
+    var element = document.createElement(tagName),
+        proto = element['__proto__'] || element.constructor.prototype;
+
+    element = null;
+    return proto;
   }
 
+  var elementPrototype = window.HTMLElement ? HTMLElement.prototype :
+   Element.prototype;
+
   if (F.ElementExtensions) {
-    copy(Element.Methods, HTMLElement.prototype);
-    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
+    copy(Element.Methods, elementPrototype);
+    copy(Element.Methods.Simulated, elementPrototype, true);
   }
 
   if (F.SpecificElementExtensions) {
@@ -2686,791 +3057,1947 @@ Element.addMethods = function(methods) {
   Element.cache = { };
 };
 
-document.viewport = {
-  getDimensions: function() {
-    var dimensions = { }, B = Prototype.Browser;
-    $w('width height').each(function(d) {
-      var D = d.capitalize();
-      if (B.WebKit && !document.evaluate) {
-        // Safari <3.0 needs self.innerWidth/Height
-        dimensions[d] = self['inner' + D];
-      } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
-        // Opera <9.5 needs document.body.clientWidth/Height
-        dimensions[d] = document.body['client' + D]
-      } else {
-        dimensions[d] = document.documentElement['client' + D];
-      }
-    });
-    return dimensions;
-  },
 
-  getWidth: function() {
-    return this.getDimensions().width;
-  },
+document.viewport = {
 
-  getHeight: function() {
-    return this.getDimensions().height;
+  getDimensions: function() {
+    return { width: this.getWidth(), height: this.getHeight() };
   },
 
   getScrollOffsets: function() {
     return Element._returnOffset(
       window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
-      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
+      window.pageYOffset || document.documentElement.scrollTop  || document.body.scrollTop);
+  }
+};
+
+(function(viewport) {
+  var B = Prototype.Browser, doc = document, element, property = {};
+
+  function getRootElement() {
+    if (B.WebKit && !doc.evaluate)
+      return document;
+
+    if (B.Opera && window.parseFloat(window.opera.version()) < 9.5)
+      return document.body;
+
+    return document.documentElement;
   }
+
+  function define(D) {
+    if (!element) element = getRootElement();
+
+    property[D] = 'client' + D;
+
+    viewport['get' + D] = function() { return element[property[D]] };
+    return viewport['get' + D]();
+  }
+
+  viewport.getWidth  = define.curry('Width');
+
+  viewport.getHeight = define.curry('Height');
+})(document.viewport);
+
+
+Element.Storage = {
+  UID: 1
 };
-/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
- * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
- * license.  Please see http://www.yui-ext.com/ for more information. */
-
-var Selector = Class.create({
-  initialize: function(expression) {
-    this.expression = expression.strip();
-
-    if (this.shouldUseSelectorsAPI()) {
-      this.mode = 'selectorsAPI';
-    } else if (this.shouldUseXPath()) {
-      this.mode = 'xpath';
-      this.compileXPathMatcher();
+
+Element.addMethods({
+  getStorage: function(element) {
+    if (!(element = $(element))) return;
+
+    var uid;
+    if (element === window) {
+      uid = 0;
     } else {
-      this.mode = "normal";
-      this.compileMatcher();
+      if (typeof element._prototypeUID === "undefined")
+        element._prototypeUID = Element.Storage.UID++;
+      uid = element._prototypeUID;
     }
 
+    if (!Element.Storage[uid])
+      Element.Storage[uid] = $H();
+
+    return Element.Storage[uid];
   },
 
-  shouldUseXPath: function() {
-    if (!Prototype.BrowserFeatures.XPath) return false;
+  store: function(element, key, value) {
+    if (!(element = $(element))) return;
 
-    var e = this.expression;
+    if (arguments.length === 2) {
+      Element.getStorage(element).update(key);
+    } else {
+      Element.getStorage(element).set(key, value);
+    }
 
-    // Safari 3 chokes on :*-of-type and :empty
-    if (Prototype.Browser.WebKit &&
-     (e.include("-of-type") || e.include(":empty")))
-      return false;
+    return element;
+  },
 
-    // XPath can't do namespaced attributes, nor can it read
-    // the "checked" property from DOM nodes
-    if ((/(\[[\w-]*?:|:checked)/).test(e))
-      return false;
+  retrieve: function(element, key, defaultValue) {
+    if (!(element = $(element))) return;
+    var hash = Element.getStorage(element), value = hash.get(key);
 
-    return true;
+    if (Object.isUndefined(value)) {
+      hash.set(key, defaultValue);
+      value = defaultValue;
+    }
+
+    return value;
+  },
+
+  clone: function(element, deep) {
+    if (!(element = $(element))) return;
+    var clone = element.cloneNode(deep);
+    clone._prototypeUID = void 0;
+    if (deep) {
+      var descendants = Element.select(clone, '*'),
+          i = descendants.length;
+      while (i--) {
+        descendants[i]._prototypeUID = void 0;
+      }
+    }
+    return Element.extend(clone);
   },
 
-  shouldUseSelectorsAPI: function() {
-    if (!Prototype.BrowserFeatures.SelectorsAPI) return false;
+  purge: function(element) {
+    if (!(element = $(element))) return;
+    var purgeElement = Element._purgeElement;
 
-    if (!Selector._div) Selector._div = new Element('div');
+    purgeElement(element);
 
-    // Make sure the browser treats the selector as valid. Test on an
-    // isolated element to minimize cost of this check.
-    try {
-      Selector._div.querySelector(this.expression);
-    } catch(e) {
-      return false;
+    var descendants = element.getElementsByTagName('*'),
+     i = descendants.length;
+
+    while (i--) purgeElement(descendants[i]);
+
+    return null;
+  }
+});
+
+(function() {
+
+  function toDecimal(pctString) {
+    var match = pctString.match(/^(\d+)%?$/i);
+    if (!match) return null;
+    return (Number(match[1]) / 100);
+  }
+
+  function getPixelValue(value, property, context) {
+    var element = null;
+    if (Object.isElement(value)) {
+      element = value;
+      value = element.getStyle(property);
     }
 
-    return true;
-  },
+    if (value === null) {
+      return null;
+    }
+
+    if ((/^(?:-)?\d+(\.\d+)?(px)?$/i).test(value)) {
+      return window.parseFloat(value);
+    }
 
-  compileMatcher: function() {
-    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
-        c = Selector.criteria, le, p, m;
+    var isPercentage = value.include('%'), isViewport = (context === document.viewport);
 
-    if (Selector._cache[e]) {
-      this.matcher = Selector._cache[e];
-      return;
+    if (/\d/.test(value) && element && element.runtimeStyle && !(isPercentage && isViewport)) {
+      var style = element.style.left, rStyle = element.runtimeStyle.left;
+      element.runtimeStyle.left = element.currentStyle.left;
+      element.style.left = value || 0;
+      value = element.style.pixelLeft;
+      element.style.left = style;
+      element.runtimeStyle.left = rStyle;
+
+      return value;
     }
 
-    this.matcher = ["this.matcher = function(root) {",
-                    "var r = root, h = Selector.handlers, c = false, n;"];
+    if (element && isPercentage) {
+      context = context || element.parentNode;
+      var decimal = toDecimal(value);
+      var whole = null;
+      var position = element.getStyle('position');
 
-    while (e && le != e && (/\S/).test(e)) {
-      le = e;
-      for (var i in ps) {
-        p = ps[i];
-        if (m = e.match(p)) {
-          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
-            new Template(c[i]).evaluate(m));
-          e = e.replace(m[0], '');
-          break;
+      var isHorizontal = property.include('left') || property.include('right') ||
+       property.include('width');
+
+      var isVertical =  property.include('top') || property.include('bottom') ||
+        property.include('height');
+
+      if (context === document.viewport) {
+        if (isHorizontal) {
+          whole = document.viewport.getWidth();
+        } else if (isVertical) {
+          whole = document.viewport.getHeight();
+        }
+      } else {
+        if (isHorizontal) {
+          whole = $(context).measure('width');
+        } else if (isVertical) {
+          whole = $(context).measure('height');
         }
       }
-    }
 
-    this.matcher.push("return h.unique(n);\n}");
-    eval(this.matcher.join('\n'));
-    Selector._cache[this.expression] = this.matcher;
-  },
+      return (whole === null) ? 0 : whole * decimal;
+    }
 
-  compileXPathMatcher: function() {
-    var e = this.expression, ps = Selector.patterns,
-        x = Selector.xpath, le, m;
+    return 0;
+  }
 
-    if (Selector._cache[e]) {
-      this.xpath = Selector._cache[e]; return;
+  function toCSSPixels(number) {
+    if (Object.isString(number) && number.endsWith('px')) {
+      return number;
     }
+    return number + 'px';
+  }
 
-    this.matcher = ['.//*'];
-    while (e && le != e && (/\S/).test(e)) {
-      le = e;
-      for (var i in ps) {
-        if (m = e.match(ps[i])) {
-          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
-            new Template(x[i]).evaluate(m));
-          e = e.replace(m[0], '');
-          break;
-        }
+  function isDisplayed(element) {
+    var originalElement = element;
+    while (element && element.parentNode) {
+      var display = element.getStyle('display');
+      if (display === 'none') {
+        return false;
       }
+      element = $(element.parentNode);
     }
+    return true;
+  }
 
-    this.xpath = this.matcher.join('');
-    Selector._cache[this.expression] = this.xpath;
-  },
+  var hasLayout = Prototype.K;
+  if ('currentStyle' in document.documentElement) {
+    hasLayout = function(element) {
+      if (!element.currentStyle.hasLayout) {
+        element.style.zoom = 1;
+      }
+      return element;
+    };
+  }
 
-  findElements: function(root) {
-    root = root || document;
-    var e = this.expression, results;
+  function cssNameFor(key) {
+    if (key.include('border')) key = key + '-width';
+    return key.camelize();
+  }
 
-    switch (this.mode) {
-      case 'selectorsAPI':
-        // querySelectorAll queries document-wide, then filters to descendants
-        // of the context element. That's not what we want.
-        // Add an explicit context to the selector if necessary.
-        if (root !== document) {
-          var oldId = root.id, id = $(root).identify();
-          e = "#" + id + " " + e;
-        }
+  Element.Layout = Class.create(Hash, {
+    initialize: function($super, element, preCompute) {
+      $super();
+      this.element = $(element);
+
+      Element.Layout.PROPERTIES.each( function(property) {
+        this._set(property, null);
+      }, this);
+
+      if (preCompute) {
+        this._preComputing = true;
+        this._begin();
+        Element.Layout.PROPERTIES.each( this._compute, this );
+        this._end();
+        this._preComputing = false;
+      }
+    },
 
-        results = $A(root.querySelectorAll(e)).map(Element.extend);
-        root.id = oldId;
+    _set: function(property, value) {
+      return Hash.prototype.set.call(this, property, value);
+    },
 
-        return results;
-      case 'xpath':
-        return document._getElementsByXPath(this.xpath, root);
-      default:
-       return this.matcher(root);
-    }
-  },
+    set: function(property, value) {
+      throw "Properties of Element.Layout are read-only.";
+    },
 
-  match: function(element) {
-    this.tokens = [];
+    get: function($super, property) {
+      var value = $super(property);
+      return value === null ? this._compute(property) : value;
+    },
 
-    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
-    var le, p, m;
+    _begin: function() {
+      if (this._prepared) return;
 
-    while (e && le !== e && (/\S/).test(e)) {
-      le = e;
-      for (var i in ps) {
-        p = ps[i];
-        if (m = e.match(p)) {
-          // use the Selector.assertions methods unless the selector
-          // is too complex.
-          if (as[i]) {
-            this.tokens.push([i, Object.clone(m)]);
-            e = e.replace(m[0], '');
-          } else {
-            // reluctantly do a document-wide search
-            // and look for a match in the array
-            return this.findElements(document).include(element);
-          }
-        }
+      var element = this.element;
+      if (isDisplayed(element)) {
+        this._prepared = true;
+        return;
       }
-    }
 
-    var match = true, name, matches;
-    for (var i = 0, token; token = this.tokens[i]; i++) {
-      name = token[0], matches = token[1];
-      if (!Selector.assertions[name](element, matches)) {
-        match = false; break;
+      var originalStyles = {
+        position:   element.style.position   || '',
+        width:      element.style.width      || '',
+        visibility: element.style.visibility || '',
+        display:    element.style.display    || ''
+      };
+
+      element.store('prototype_original_styles', originalStyles);
+
+      var position = element.getStyle('position'),
+       width = element.getStyle('width');
+
+      if (width === "0px" || width === null) {
+        element.style.display = 'block';
+        width = element.getStyle('width');
       }
-    }
 
-    return match;
-  },
+      var context = (position === 'fixed') ? document.viewport :
+       element.parentNode;
 
-  toString: function() {
-    return this.expression;
-  },
+      element.setStyle({
+        position:   'absolute',
+        visibility: 'hidden',
+        display:    'block'
+      });
 
-  inspect: function() {
-    return "#<Selector:" + this.expression.inspect() + ">";
-  }
-});
+      var positionedWidth = element.getStyle('width');
 
-Object.extend(Selector, {
-  _cache: { },
-
-  xpath: {
-    descendant:   "//*",
-    child:        "/*",
-    adjacent:     "/following-sibling::*[1]",
-    laterSibling: '/following-sibling::*',
-    tagName:      function(m) {
-      if (m[1] == '*') return '';
-      return "[local-name()='" + m[1].toLowerCase() +
-             "' or local-name()='" + m[1].toUpperCase() + "']";
+      var newWidth;
+      if (width && (positionedWidth === width)) {
+        newWidth = getPixelValue(element, 'width', context);
+      } else if (position === 'absolute' || position === 'fixed') {
+        newWidth = getPixelValue(element, 'width', context);
+      } else {
+        var parent = element.parentNode, pLayout = $(parent).getLayout();
+
+        newWidth = pLayout.get('width') -
+         this.get('margin-left') -
+         this.get('border-left') -
+         this.get('padding-left') -
+         this.get('padding-right') -
+         this.get('border-right') -
+         this.get('margin-right');
+      }
+
+      element.setStyle({ width: newWidth + 'px' });
+
+      this._prepared = true;
     },
-    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
-    id:           "[@id='#{1}']",
-    attrPresence: function(m) {
-      m[1] = m[1].toLowerCase();
-      return new Template("[@#{1}]").evaluate(m);
+
+    _end: function() {
+      var element = this.element;
+      var originalStyles = element.retrieve('prototype_original_styles');
+      element.store('prototype_original_styles', null);
+      element.setStyle(originalStyles);
+      this._prepared = false;
     },
-    attr: function(m) {
-      m[1] = m[1].toLowerCase();
-      m[3] = m[5] || m[6];
-      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
+
+    _compute: function(property) {
+      var COMPUTATIONS = Element.Layout.COMPUTATIONS;
+      if (!(property in COMPUTATIONS)) {
+        throw "Property not found.";
+      }
+
+      return this._set(property, COMPUTATIONS[property].call(this, this.element));
     },
-    pseudo: function(m) {
-      var h = Selector.xpath.pseudos[m[1]];
-      if (!h) return '';
-      if (Object.isFunction(h)) return h(m);
-      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
+
+    toObject: function() {
+      var args = $A(arguments);
+      var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
+       args.join(' ').split(' ');
+      var obj = {};
+      keys.each( function(key) {
+        if (!Element.Layout.PROPERTIES.include(key)) return;
+        var value = this.get(key);
+        if (value != null) obj[key] = value;
+      }, this);
+      return obj;
     },
-    operators: {
-      '=':  "[@#{1}='#{3}']",
-      '!=': "[@#{1}!='#{3}']",
-      '^=': "[starts-with(@#{1}, '#{3}')]",
-      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
-      '*=': "[contains(@#{1}, '#{3}')]",
-      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
-      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
+
+    toHash: function() {
+      var obj = this.toObject.apply(this, arguments);
+      return new Hash(obj);
     },
-    pseudos: {
-      'first-child': '[not(preceding-sibling::*)]',
-      'last-child':  '[not(following-sibling::*)]',
-      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
-      'empty':       "[count(*) = 0 and (count(text()) = 0)]",
-      'checked':     "[@checked]",
-      'disabled':    "[(@disabled) and (@type!='hidden')]",
-      'enabled':     "[not(@disabled) and (@type!='hidden')]",
-      'not': function(m) {
-        var e = m[6], p = Selector.patterns,
-            x = Selector.xpath, le, v;
-
-        var exclusion = [];
-        while (e && le != e && (/\S/).test(e)) {
-          le = e;
-          for (var i in p) {
-            if (m = e.match(p[i])) {
-              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
-              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
-              e = e.replace(m[0], '');
-              break;
-            }
-          }
+
+    toCSS: function() {
+      var args = $A(arguments);
+      var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
+       args.join(' ').split(' ');
+      var css = {};
+
+      keys.each( function(key) {
+        if (!Element.Layout.PROPERTIES.include(key)) return;
+        if (Element.Layout.COMPOSITE_PROPERTIES.include(key)) return;
+
+        var value = this.get(key);
+        if (value != null) css[cssNameFor(key)] = value + 'px';
+      }, this);
+      return css;
+    },
+
+    inspect: function() {
+      return "#<Element.Layout>";
+    }
+  });
+
+  Object.extend(Element.Layout, {
+    PROPERTIES: $w('height width top left right bottom border-left border-right border-top border-bottom padding-left padding-right padding-top padding-bottom margin-top margin-bottom margin-left margin-right padding-box-width padding-box-height border-box-width border-box-height margin-box-width margin-box-height'),
+
+    COMPOSITE_PROPERTIES: $w('padding-box-width padding-box-height margin-box-width margin-box-height border-box-width border-box-height'),
+
+    COMPUTATIONS: {
+      'height': function(element) {
+        if (!this._preComputing) this._begin();
+
+        var bHeight = this.get('border-box-height');
+        if (bHeight <= 0) {
+          if (!this._preComputing) this._end();
+          return 0;
+        }
+
+        var bTop = this.get('border-top'),
+         bBottom = this.get('border-bottom');
+
+        var pTop = this.get('padding-top'),
+         pBottom = this.get('padding-bottom');
+
+        if (!this._preComputing) this._end();
+
+        return bHeight - bTop - bBottom - pTop - pBottom;
+      },
+
+      'width': function(element) {
+        if (!this._preComputing) this._begin();
+
+        var bWidth = this.get('border-box-width');
+        if (bWidth <= 0) {
+          if (!this._preComputing) this._end();
+          return 0;
         }
-        return "[not(" + exclusion.join(" and ") + ")]";
+
+        var bLeft = this.get('border-left'),
+         bRight = this.get('border-right');
+
+        var pLeft = this.get('padding-left'),
+         pRight = this.get('padding-right');
+
+        if (!this._preComputing) this._end();
+
+        return bWidth - bLeft - bRight - pLeft - pRight;
+      },
+
+      'padding-box-height': function(element) {
+        var height = this.get('height'),
+         pTop = this.get('padding-top'),
+         pBottom = this.get('padding-bottom');
+
+        return height + pTop + pBottom;
+      },
+
+      'padding-box-width': function(element) {
+        var width = this.get('width'),
+         pLeft = this.get('padding-left'),
+         pRight = this.get('padding-right');
+
+        return width + pLeft + pRight;
+      },
+
+      'border-box-height': function(element) {
+        if (!this._preComputing) this._begin();
+        var height = element.offsetHeight;
+        if (!this._preComputing) this._end();
+        return height;
       },
-      'nth-child':      function(m) {
-        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
+
+      'border-box-width': function(element) {
+        if (!this._preComputing) this._begin();
+        var width = element.offsetWidth;
+        if (!this._preComputing) this._end();
+        return width;
+      },
+
+      'margin-box-height': function(element) {
+        var bHeight = this.get('border-box-height'),
+         mTop = this.get('margin-top'),
+         mBottom = this.get('margin-bottom');
+
+        if (bHeight <= 0) return 0;
+
+        return bHeight + mTop + mBottom;
+      },
+
+      'margin-box-width': function(element) {
+        var bWidth = this.get('border-box-width'),
+         mLeft = this.get('margin-left'),
+         mRight = this.get('margin-right');
+
+        if (bWidth <= 0) return 0;
+
+        return bWidth + mLeft + mRight;
       },
-      'nth-last-child': function(m) {
-        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
+
+      'top': function(element) {
+        var offset = element.positionedOffset();
+        return offset.top;
       },
-      'nth-of-type':    function(m) {
-        return Selector.xpath.pseudos.nth("position() ", m);
+
+      'bottom': function(element) {
+        var offset = element.positionedOffset(),
+         parent = element.getOffsetParent(),
+         pHeight = parent.measure('height');
+
+        var mHeight = this.get('border-box-height');
+
+        return pHeight - mHeight - offset.top;
       },
-      'nth-last-of-type': function(m) {
-        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
+
+      'left': function(element) {
+        var offset = element.positionedOffset();
+        return offset.left;
       },
-      'first-of-type':  function(m) {
-        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
+
+      'right': function(element) {
+        var offset = element.positionedOffset(),
+         parent = element.getOffsetParent(),
+         pWidth = parent.measure('width');
+
+        var mWidth = this.get('border-box-width');
+
+        return pWidth - mWidth - offset.left;
       },
-      'last-of-type':   function(m) {
-        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
+
+      'padding-top': function(element) {
+        return getPixelValue(element, 'paddingTop');
       },
-      'only-of-type':   function(m) {
-        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
+
+      'padding-bottom': function(element) {
+        return getPixelValue(element, 'paddingBottom');
       },
-      nth: function(fragment, m) {
-        var mm, formula = m[6], predicate;
-        if (formula == 'even') formula = '2n+0';
-        if (formula == 'odd')  formula = '2n+1';
-        if (mm = formula.match(/^(\d+)$/)) // digit only
-          return '[' + fragment + "= " + mm[1] + ']';
-        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
-          if (mm[1] == "-") mm[1] = -1;
-          var a = mm[1] ? Number(mm[1]) : 1;
-          var b = mm[2] ? Number(mm[2]) : 0;
-          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
-          "((#{fragment} - #{b}) div #{a} >= 0)]";
-          return new Template(predicate).evaluate({
-            fragment: fragment, a: a, b: b });
-        }
+
+      'padding-left': function(element) {
+        return getPixelValue(element, 'paddingLeft');
+      },
+
+      'padding-right': function(element) {
+        return getPixelValue(element, 'paddingRight');
+      },
+
+      'border-top': function(element) {
+        return getPixelValue(element, 'borderTopWidth');
+      },
+
+      'border-bottom': function(element) {
+        return getPixelValue(element, 'borderBottomWidth');
+      },
+
+      'border-left': function(element) {
+        return getPixelValue(element, 'borderLeftWidth');
+      },
+
+      'border-right': function(element) {
+        return getPixelValue(element, 'borderRightWidth');
+      },
+
+      'margin-top': function(element) {
+        return getPixelValue(element, 'marginTop');
+      },
+
+      'margin-bottom': function(element) {
+        return getPixelValue(element, 'marginBottom');
+      },
+
+      'margin-left': function(element) {
+        return getPixelValue(element, 'marginLeft');
+      },
+
+      'margin-right': function(element) {
+        return getPixelValue(element, 'marginRight');
       }
     }
-  },
+  });
 
-  criteria: {
-    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
-    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
-    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
-    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
-    attr: function(m) {
-      m[3] = (m[5] || m[6]);
-      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
-    },
-    pseudo: function(m) {
-      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
-      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
-    },
-    descendant:   'c = "descendant";',
-    child:        'c = "child";',
-    adjacent:     'c = "adjacent";',
-    laterSibling: 'c = "laterSibling";'
-  },
-
-  patterns: {
-    // combinators must be listed first
-    // (and descendant needs to be last combinator)
-    laterSibling: /^\s*~\s*/,
-    child:        /^\s*>\s*/,
-    adjacent:     /^\s*\+\s*/,
-    descendant:   /^\s/,
-
-    // selectors follow
-    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
-    id:           /^#([\w\-\*]+)(\b|$)/,
-    className:    /^\.([\w\-\*]+)(\b|$)/,
-    pseudo:
-/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
-    attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
-    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
-  },
-
-  // for Selector.match and Element#match
-  assertions: {
-    tagName: function(element, matches) {
-      return matches[1].toUpperCase() == element.tagName.toUpperCase();
+  if ('getBoundingClientRect' in document.documentElement) {
+    Object.extend(Element.Layout.COMPUTATIONS, {
+      'right': function(element) {
+        var parent = hasLayout(element.getOffsetParent());
+        var rect = element.getBoundingClientRect(),
+         pRect = parent.getBoundingClientRect();
+
+        return (pRect.right - rect.right).round();
+      },
+
+      'bottom': function(element) {
+        var parent = hasLayout(element.getOffsetParent());
+        var rect = element.getBoundingClientRect(),
+         pRect = parent.getBoundingClientRect();
+
+        return (pRect.bottom - rect.bottom).round();
+      }
+    });
+  }
+
+  Element.Offset = Class.create({
+    initialize: function(left, top) {
+      this.left = left.round();
+      this.top  = top.round();
+
+      this[0] = this.left;
+      this[1] = this.top;
     },
 
-    className: function(element, matches) {
-      return Element.hasClassName(element, matches[1]);
+    relativeTo: function(offset) {
+      return new Element.Offset(
+        this.left - offset.left,
+        this.top  - offset.top
+      );
     },
 
-    id: function(element, matches) {
-      return element.id === matches[1];
+    inspect: function() {
+      return "#<Element.Offset left: #{left} top: #{top}>".interpolate(this);
     },
 
-    attrPresence: function(element, matches) {
-      return Element.hasAttribute(element, matches[1]);
+    toString: function() {
+      return "[#{left}, #{top}]".interpolate(this);
     },
 
-    attr: function(element, matches) {
-      var nodeValue = Element.readAttribute(element, matches[1]);
-      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
+    toArray: function() {
+      return [this.left, this.top];
     }
-  },
+  });
 
-  handlers: {
-    // UTILITY FUNCTIONS
-    // joins two collections
-    concat: function(a, b) {
-      for (var i = 0, node; node = b[i]; i++)
-        a.push(node);
-      return a;
-    },
+  function getLayout(element, preCompute) {
+    return new Element.Layout(element, preCompute);
+  }
 
-    // marks an array of nodes for counting
-    mark: function(nodes) {
-      var _true = Prototype.emptyFunction;
-      for (var i = 0, node; node = nodes[i]; i++)
-        node._countedByPrototype = _true;
-      return nodes;
-    },
+  function measure(element, property) {
+    return $(element).getLayout().get(property);
+  }
+
+  function getDimensions(element) {
+    element = $(element);
+    var display = Element.getStyle(element, 'display');
+
+    if (display && display !== 'none') {
+      return { width: element.offsetWidth, height: element.offsetHeight };
+    }
+
+    var style = element.style;
+    var originalStyles = {
+      visibility: style.visibility,
+      position:   style.position,
+      display:    style.display
+    };
+
+    var newStyles = {
+      visibility: 'hidden',
+      display:    'block'
+    };
+
+    if (originalStyles.position !== 'fixed')
+      newStyles.position = 'absolute';
+
+    Element.setStyle(element, newStyles);
+
+    var dimensions = {
+      width:  element.offsetWidth,
+      height: element.offsetHeight
+    };
+
+    Element.setStyle(element, originalStyles);
+
+    return dimensions;
+  }
+
+  function getOffsetParent(element) {
+    element = $(element);
+
+    if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
+      return $(document.body);
+
+    var isInline = (Element.getStyle(element, 'display') === 'inline');
+    if (!isInline && element.offsetParent) return $(element.offsetParent);
+
+    while ((element = element.parentNode) && element !== document.body) {
+      if (Element.getStyle(element, 'position') !== 'static') {
+        return isHtml(element) ? $(document.body) : $(element);
+      }
+    }
+
+    return $(document.body);
+  }
+
+
+  function cumulativeOffset(element) {
+    element = $(element);
+    var valueT = 0, valueL = 0;
+    if (element.parentNode) {
+      do {
+        valueT += element.offsetTop  || 0;
+        valueL += element.offsetLeft || 0;
+        element = element.offsetParent;
+      } while (element);
+    }
+    return new Element.Offset(valueL, valueT);
+  }
+
+  function positionedOffset(element) {
+    element = $(element);
+
+    var layout = element.getLayout();
+
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      element = element.offsetParent;
+      if (element) {
+        if (isBody(element)) break;
+        var p = Element.getStyle(element, 'position');
+        if (p !== 'static') break;
+      }
+    } while (element);
+
+    valueL -= layout.get('margin-top');
+    valueT -= layout.get('margin-left');
+
+    return new Element.Offset(valueL, valueT);
+  }
+
+  function cumulativeScrollOffset(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.scrollTop  || 0;
+      valueL += element.scrollLeft || 0;
+      element = element.parentNode;
+    } while (element);
+    return new Element.Offset(valueL, valueT);
+  }
+
+  function viewportOffset(forElement) {
+    element = $(element);
+    var valueT = 0, valueL = 0, docBody = document.body;
+
+    var element = forElement;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      if (element.offsetParent == docBody &&
+        Element.getStyle(element, 'position') == 'absolute') break;
+    } while (element = element.offsetParent);
+
+    element = forElement;
+    do {
+      if (element != docBody) {
+        valueT -= element.scrollTop  || 0;
+        valueL -= element.scrollLeft || 0;
+      }
+    } while (element = element.parentNode);
+    return new Element.Offset(valueL, valueT);
+  }
+
+  function absolutize(element) {
+    element = $(element);
+
+    if (Element.getStyle(element, 'position') === 'absolute') {
+      return element;
+    }
+
+    var offsetParent = getOffsetParent(element);
+    var eOffset = element.viewportOffset(),
+     pOffset = offsetParent.viewportOffset();
+
+    var offset = eOffset.relativeTo(pOffset);
+    var layout = element.getLayout();
+
+    element.store('prototype_absolutize_original_styles', {
+      left:   element.getStyle('left'),
+      top:    element.getStyle('top'),
+      width:  element.getStyle('width'),
+      height: element.getStyle('height')
+    });
+
+    element.setStyle({
+      position: 'absolute',
+      top:    offset.top + 'px',
+      left:   offset.left + 'px',
+      width:  layout.get('width') + 'px',
+      height: layout.get('height') + 'px'
+    });
+
+    return element;
+  }
+
+  function relativize(element) {
+    element = $(element);
+    if (Element.getStyle(element, 'position') === 'relative') {
+      return element;
+    }
+
+    var originalStyles =
+     element.retrieve('prototype_absolutize_original_styles');
+
+    if (originalStyles) element.setStyle(originalStyles);
+    return element;
+  }
+
+  if (Prototype.Browser.IE) {
+    getOffsetParent = getOffsetParent.wrap(
+      function(proceed, element) {
+        element = $(element);
+
+        if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
+          return $(document.body);
+
+        var position = element.getStyle('position');
+        if (position !== 'static') return proceed(element);
+
+        element.setStyle({ position: 'relative' });
+        var value = proceed(element);
+        element.setStyle({ position: position });
+        return value;
+      }
+    );
+
+    positionedOffset = positionedOffset.wrap(function(proceed, element) {
+      element = $(element);
+      if (!element.parentNode) return new Element.Offset(0, 0);
+      var position = element.getStyle('position');
+      if (position !== 'static') return proceed(element);
+
+      var offsetParent = element.getOffsetParent();
+      if (offsetParent && offsetParent.getStyle('position') === 'fixed')
+        hasLayout(offsetParent);
+
+      element.setStyle({ position: 'relative' });
+      var value = proceed(element);
+      element.setStyle({ position: position });
+      return value;
+    });
+  } else if (Prototype.Browser.Webkit) {
+    cumulativeOffset = function(element) {
+      element = $(element);
+      var valueT = 0, valueL = 0;
+      do {
+        valueT += element.offsetTop  || 0;
+        valueL += element.offsetLeft || 0;
+        if (element.offsetParent == document.body)
+          if (Element.getStyle(element, 'position') == 'absolute') break;
+
+        element = element.offsetParent;
+      } while (element);
+
+      return new Element.Offset(valueL, valueT);
+    };
+  }
 
-    unmark: function(nodes) {
-      for (var i = 0, node; node = nodes[i]; i++)
-        node._countedByPrototype = undefined;
-      return nodes;
-    },
 
-    // mark each child node with its position (for nth calls)
-    // "ofType" flag indicates whether we're indexing for nth-of-type
-    // rather than nth-child
-    index: function(parentNode, reverse, ofType) {
-      parentNode._countedByPrototype = Prototype.emptyFunction;
-      if (reverse) {
-        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
-          var node = nodes[i];
-          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
+  Element.addMethods({
+    getLayout:              getLayout,
+    measure:                measure,
+    getDimensions:          getDimensions,
+    getOffsetParent:        getOffsetParent,
+    cumulativeOffset:       cumulativeOffset,
+    positionedOffset:       positionedOffset,
+    cumulativeScrollOffset: cumulativeScrollOffset,
+    viewportOffset:         viewportOffset,
+    absolutize:             absolutize,
+    relativize:             relativize
+  });
+
+  function isBody(element) {
+    return element.nodeName.toUpperCase() === 'BODY';
+  }
+
+  function isHtml(element) {
+    return element.nodeName.toUpperCase() === 'HTML';
+  }
+
+  function isDocument(element) {
+    return element.nodeType === Node.DOCUMENT_NODE;
+  }
+
+  function isDetached(element) {
+    return element !== document.body &&
+     !Element.descendantOf(element, document.body);
+  }
+
+  if ('getBoundingClientRect' in document.documentElement) {
+    Element.addMethods({
+      viewportOffset: function(element) {
+        element = $(element);
+        if (isDetached(element)) return new Element.Offset(0, 0);
+
+        var rect = element.getBoundingClientRect(),
+         docEl = document.documentElement;
+        return new Element.Offset(rect.left - docEl.clientLeft,
+         rect.top - docEl.clientTop);
+      }
+    });
+  }
+})();
+window.$$ = function() {
+  var expression = $A(arguments).join(', ');
+  return Prototype.Selector.select(expression, document);
+};
+
+Prototype.Selector = (function() {
+
+  function select() {
+    throw new Error('Method "Prototype.Selector.select" must be defined.');
+  }
+
+  function match() {
+    throw new Error('Method "Prototype.Selector.match" must be defined.');
+  }
+
+  function find(elements, expression, index) {
+    index = index || 0;
+    var match = Prototype.Selector.match, length = elements.length, matchIndex = 0, i;
+
+    for (i = 0; i < length; i++) {
+      if (match(elements[i], expression) && index == matchIndex++) {
+        return Element.extend(elements[i]);
+      }
+    }
+  }
+
+  function extendElements(elements) {
+    for (var i = 0, length = elements.length; i < length; i++) {
+      Element.extend(elements[i]);
+    }
+    return elements;
+  }
+
+
+  var K = Prototype.K;
+
+  return {
+    select: select,
+    match: match,
+    find: find,
+    extendElements: (Element.extend === K) ? K : extendElements,
+    extendElement: Element.extend
+  };
+})();
+Prototype._original_property = window.Sizzle;
+/*!
+ * Sizzle CSS Selector Engine - v1.0
+ *  Copyright 2009, The Dojo Foundation
+ *  Released under the MIT, BSD, and GPL Licenses.
+ *  More information: http://sizzlejs.com/
+ */
+(function(){
+
+var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^[\]]*\]|['"][^'"]*['"]|[^[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,
+  done = 0,
+  toString = Object.prototype.toString,
+  hasDuplicate = false,
+  baseHasDuplicate = true;
+
+[0, 0].sort(function(){
+  baseHasDuplicate = false;
+  return 0;
+});
+
+var Sizzle = function(selector, context, results, seed) {
+  results = results || [];
+  var origContext = context = context || document;
+
+  if ( context.nodeType !== 1 && context.nodeType !== 9 ) {
+    return [];
+  }
+
+  if ( !selector || typeof selector !== "string" ) {
+    return results;
+  }
+
+  var parts = [], m, set, checkSet, check, mode, extra, prune = true, contextXML = isXML(context),
+    soFar = selector;
+
+  while ( (chunker.exec(""), m = chunker.exec(soFar)) !== null ) {
+    soFar = m[3];
+
+    parts.push( m[1] );
+
+    if ( m[2] ) {
+      extra = m[3];
+      break;
+    }
+  }
+
+  if ( parts.length > 1 && origPOS.exec( selector ) ) {
+    if ( parts.length === 2 && Expr.relative[ parts[0] ] ) {
+      set = posProcess( parts[0] + parts[1], context );
+    } else {
+      set = Expr.relative[ parts[0] ] ?
+        [ context ] :
+        Sizzle( parts.shift(), context );
+
+      while ( parts.length ) {
+        selector = parts.shift();
+
+        if ( Expr.relative[ selector ] )
+          selector += parts.shift();
+
+        set = posProcess( selector, set );
+      }
+    }
+  } else {
+    if ( !seed && parts.length > 1 && context.nodeType === 9 && !contextXML &&
+        Expr.match.ID.test(parts[0]) && !Expr.match.ID.test(parts[parts.length - 1]) ) {
+      var ret = Sizzle.find( parts.shift(), context, contextXML );
+      context = ret.expr ? Sizzle.filter( ret.expr, ret.set )[0] : ret.set[0];
+    }
+
+    if ( context ) {
+      var ret = seed ?
+        { expr: parts.pop(), set: makeArray(seed) } :
+        Sizzle.find( parts.pop(), parts.length === 1 && (parts[0] === "~" || parts[0] === "+") && context.parentNode ? context.parentNode : context, contextXML );
+      set = ret.expr ? Sizzle.filter( ret.expr, ret.set ) : ret.set;
+
+      if ( parts.length > 0 ) {
+        checkSet = makeArray(set);
+      } else {
+        prune = false;
+      }
+
+      while ( parts.length ) {
+        var cur = parts.pop(), pop = cur;
+
+        if ( !Expr.relative[ cur ] ) {
+          cur = "";
+        } else {
+          pop = parts.pop();
+        }
+
+        if ( pop == null ) {
+          pop = context;
+        }
+
+        Expr.relative[ cur ]( checkSet, pop, contextXML );
+      }
+    } else {
+      checkSet = parts = [];
+    }
+  }
+
+  if ( !checkSet ) {
+    checkSet = set;
+  }
+
+  if ( !checkSet ) {
+    throw "Syntax error, unrecognized expression: " + (cur || selector);
+  }
+
+  if ( toString.call(checkSet) === "[object Array]" ) {
+    if ( !prune ) {
+      results.push.apply( results, checkSet );
+    } else if ( context && context.nodeType === 1 ) {
+      for ( var i = 0; checkSet[i] != null; i++ ) {
+        if ( checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && contains(context, checkSet[i])) ) {
+          results.push( set[i] );
+        }
+      }
+    } else {
+      for ( var i = 0; checkSet[i] != null; i++ ) {
+        if ( checkSet[i] && checkSet[i].nodeType === 1 ) {
+          results.push( set[i] );
+        }
+      }
+    }
+  } else {
+    makeArray( checkSet, results );
+  }
+
+  if ( extra ) {
+    Sizzle( extra, origContext, results, seed );
+    Sizzle.uniqueSort( results );
+  }
+
+  return results;
+};
+
+Sizzle.uniqueSort = function(results){
+  if ( sortOrder ) {
+    hasDuplicate = baseHasDuplicate;
+    results.sort(sortOrder);
+
+    if ( hasDuplicate ) {
+      for ( var i = 1; i < results.length; i++ ) {
+        if ( results[i] === results[i-1] ) {
+          results.splice(i--, 1);
+        }
+      }
+    }
+  }
+
+  return results;
+};
+
+Sizzle.matches = function(expr, set){
+  return Sizzle(expr, null, null, set);
+};
+
+Sizzle.find = function(expr, context, isXML){
+  var set, match;
+
+  if ( !expr ) {
+    return [];
+  }
+
+  for ( var i = 0, l = Expr.order.length; i < l; i++ ) {
+    var type = Expr.order[i], match;
+
+    if ( (match = Expr.leftMatch[ type ].exec( expr )) ) {
+      var left = match[1];
+      match.splice(1,1);
+
+      if ( left.substr( left.length - 1 ) !== "\\" ) {
+        match[1] = (match[1] || "").replace(/\\/g, "");
+        set = Expr.find[ type ]( match, context, isXML );
+        if ( set != null ) {
+          expr = expr.replace( Expr.match[ type ], "" );
+          break;
         }
+      }
+    }
+  }
+
+  if ( !set ) {
+    set = context.getElementsByTagName("*");
+  }
+
+  return {set: set, expr: expr};
+};
+
+Sizzle.filter = function(expr, set, inplace, not){
+  var old = expr, result = [], curLoop = set, match, anyFound,
+    isXMLFilter = set && set[0] && isXML(set[0]);
+
+  while ( expr && set.length ) {
+    for ( var type in Expr.filter ) {
+      if ( (match = Expr.match[ type ].exec( expr )) != null ) {
+        var filter = Expr.filter[ type ], found, item;
+        anyFound = false;
+
+        if ( curLoop == result ) {
+          result = [];
+        }
+
+        if ( Expr.preFilter[ type ] ) {
+          match = Expr.preFilter[ type ]( match, curLoop, inplace, result, not, isXMLFilter );
+
+          if ( !match ) {
+            anyFound = found = true;
+          } else if ( match === true ) {
+            continue;
+          }
+        }
+
+        if ( match ) {
+          for ( var i = 0; (item = curLoop[i]) != null; i++ ) {
+            if ( item ) {
+              found = filter( item, match, i, curLoop );
+              var pass = not ^ !!found;
+
+              if ( inplace && found != null ) {
+                if ( pass ) {
+                  anyFound = true;
+                } else {
+                  curLoop[i] = false;
+                }
+              } else if ( pass ) {
+                result.push( item );
+                anyFound = true;
+              }
+            }
+          }
+        }
+
+        if ( found !== undefined ) {
+          if ( !inplace ) {
+            curLoop = result;
+          }
+
+          expr = expr.replace( Expr.match[ type ], "" );
+
+          if ( !anyFound ) {
+            return [];
+          }
+
+          break;
+        }
+      }
+    }
+
+    if ( expr == old ) {
+      if ( anyFound == null ) {
+        throw "Syntax error, unrecognized expression: " + expr;
       } else {
-        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
-          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
+        break;
+      }
+    }
+
+    old = expr;
+  }
+
+  return curLoop;
+};
+
+var Expr = Sizzle.selectors = {
+  order: [ "ID", "NAME", "TAG" ],
+  match: {
+    ID: /#((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
+    CLASS: /\.((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
+    NAME: /\[name=['"]*((?:[\w\u00c0-\uFFFF-]|\\.)+)['"]*\]/,
+    ATTR: /\[\s*((?:[\w\u00c0-\uFFFF-]|\\.)+)\s*(?:(\S?=)\s*(['"]*)(.*?)\3|)\s*\]/,
+    TAG: /^((?:[\w\u00c0-\uFFFF\*-]|\\.)+)/,
+    CHILD: /:(only|nth|last|first)-child(?:\((even|odd|[\dn+-]*)\))?/,
+    POS: /:(nth|eq|gt|lt|first|last|even|odd)(?:\((\d*)\))?(?=[^-]|$)/,
+    PSEUDO: /:((?:[\w\u00c0-\uFFFF-]|\\.)+)(?:\((['"]*)((?:\([^\)]+\)|[^\2\(\)]*)+)\2\))?/
+  },
+  leftMatch: {},
+  attrMap: {
+    "class": "className",
+    "for": "htmlFor"
+  },
+  attrHandle: {
+    href: function(elem){
+      return elem.getAttribute("href");
+    }
+  },
+  relative: {
+    "+": function(checkSet, part, isXML){
+      var isPartStr = typeof part === "string",
+        isTag = isPartStr && !/\W/.test(part),
+        isPartStrNotTag = isPartStr && !isTag;
+
+      if ( isTag && !isXML ) {
+        part = part.toUpperCase();
       }
-    },
 
-    // filters out duplicates and extends all nodes
-    unique: function(nodes) {
-      if (nodes.length == 0) return nodes;
-      var results = [], n;
-      for (var i = 0, l = nodes.length; i < l; i++)
-        if (!(n = nodes[i])._countedByPrototype) {
-          n._countedByPrototype = Prototype.emptyFunction;
-          results.push(Element.extend(n));
+      for ( var i = 0, l = checkSet.length, elem; i < l; i++ ) {
+        if ( (elem = checkSet[i]) ) {
+          while ( (elem = elem.previousSibling) && elem.nodeType !== 1 ) {}
+
+          checkSet[i] = isPartStrNotTag || elem && elem.nodeName === part ?
+            elem || false :
+            elem === part;
         }
-      return Selector.handlers.unmark(results);
-    },
+      }
 
-    // COMBINATOR FUNCTIONS
-    descendant: function(nodes) {
-      var h = Selector.handlers;
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        h.concat(results, node.getElementsByTagName('*'));
-      return results;
+      if ( isPartStrNotTag ) {
+        Sizzle.filter( part, checkSet, true );
+      }
     },
+    ">": function(checkSet, part, isXML){
+      var isPartStr = typeof part === "string";
+
+      if ( isPartStr && !/\W/.test(part) ) {
+        part = isXML ? part : part.toUpperCase();
+
+        for ( var i = 0, l = checkSet.length; i < l; i++ ) {
+          var elem = checkSet[i];
+          if ( elem ) {
+            var parent = elem.parentNode;
+            checkSet[i] = parent.nodeName === part ? parent : false;
+          }
+        }
+      } else {
+        for ( var i = 0, l = checkSet.length; i < l; i++ ) {
+          var elem = checkSet[i];
+          if ( elem ) {
+            checkSet[i] = isPartStr ?
+              elem.parentNode :
+              elem.parentNode === part;
+          }
+        }
 
-    child: function(nodes) {
-      var h = Selector.handlers;
-      for (var i = 0, results = [], node; node = nodes[i]; i++) {
-        for (var j = 0, child; child = node.childNodes[j]; j++)
-          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
+        if ( isPartStr ) {
+          Sizzle.filter( part, checkSet, true );
+        }
       }
-      return results;
     },
+    "": function(checkSet, part, isXML){
+      var doneName = done++, checkFn = dirCheck;
 
-    adjacent: function(nodes) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++) {
-        var next = this.nextElementSibling(node);
-        if (next) results.push(next);
+      if ( !/\W/.test(part) ) {
+        var nodeCheck = part = isXML ? part : part.toUpperCase();
+        checkFn = dirNodeCheck;
       }
-      return results;
-    },
 
-    laterSibling: function(nodes) {
-      var h = Selector.handlers;
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        h.concat(results, Element.nextSiblings(node));
-      return results;
+      checkFn("parentNode", part, doneName, checkSet, nodeCheck, isXML);
     },
+    "~": function(checkSet, part, isXML){
+      var doneName = done++, checkFn = dirCheck;
 
-    nextElementSibling: function(node) {
-      while (node = node.nextSibling)
-        if (node.nodeType == 1) return node;
-      return null;
-    },
+      if ( typeof part === "string" && !/\W/.test(part) ) {
+        var nodeCheck = part = isXML ? part : part.toUpperCase();
+        checkFn = dirNodeCheck;
+      }
 
-    previousElementSibling: function(node) {
-      while (node = node.previousSibling)
-        if (node.nodeType == 1) return node;
-      return null;
+      checkFn("previousSibling", part, doneName, checkSet, nodeCheck, isXML);
+    }
+  },
+  find: {
+    ID: function(match, context, isXML){
+      if ( typeof context.getElementById !== "undefined" && !isXML ) {
+        var m = context.getElementById(match[1]);
+        return m ? [m] : [];
+      }
     },
+    NAME: function(match, context, isXML){
+      if ( typeof context.getElementsByName !== "undefined" ) {
+        var ret = [], results = context.getElementsByName(match[1]);
 
-    // TOKEN FUNCTIONS
-    tagName: function(nodes, root, tagName, combinator) {
-      var uTagName = tagName.toUpperCase();
-      var results = [], h = Selector.handlers;
-      if (nodes) {
-        if (combinator) {
-          // fastlane for ordinary descendant combinators
-          if (combinator == "descendant") {
-            for (var i = 0, node; node = nodes[i]; i++)
-              h.concat(results, node.getElementsByTagName(tagName));
-            return results;
-          } else nodes = this[combinator](nodes);
-          if (tagName == "*") return nodes;
+        for ( var i = 0, l = results.length; i < l; i++ ) {
+          if ( results[i].getAttribute("name") === match[1] ) {
+            ret.push( results[i] );
+          }
         }
-        for (var i = 0, node; node = nodes[i]; i++)
-          if (node.tagName.toUpperCase() === uTagName) results.push(node);
-        return results;
-      } else return root.getElementsByTagName(tagName);
-    },
 
-    id: function(nodes, root, id, combinator) {
-      var targetNode = $(id), h = Selector.handlers;
-      if (!targetNode) return [];
-      if (!nodes && root == document) return [targetNode];
-      if (nodes) {
-        if (combinator) {
-          if (combinator == 'child') {
-            for (var i = 0, node; node = nodes[i]; i++)
-              if (targetNode.parentNode == node) return [targetNode];
-          } else if (combinator == 'descendant') {
-            for (var i = 0, node; node = nodes[i]; i++)
-              if (Element.descendantOf(targetNode, node)) return [targetNode];
-          } else if (combinator == 'adjacent') {
-            for (var i = 0, node; node = nodes[i]; i++)
-              if (Selector.handlers.previousElementSibling(targetNode) == node)
-                return [targetNode];
-          } else nodes = h[combinator](nodes);
-        }
-        for (var i = 0, node; node = nodes[i]; i++)
-          if (node == targetNode) return [targetNode];
-        return [];
+        return ret.length === 0 ? null : ret;
       }
-      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
     },
+    TAG: function(match, context){
+      return context.getElementsByTagName(match[1]);
+    }
+  },
+  preFilter: {
+    CLASS: function(match, curLoop, inplace, result, not, isXML){
+      match = " " + match[1].replace(/\\/g, "") + " ";
 
-    className: function(nodes, root, className, combinator) {
-      if (nodes && combinator) nodes = this[combinator](nodes);
-      return Selector.handlers.byClassName(nodes, root, className);
-    },
+      if ( isXML ) {
+        return match;
+      }
 
-    byClassName: function(nodes, root, className) {
-      if (!nodes) nodes = Selector.handlers.descendant([root]);
-      var needle = ' ' + className + ' ';
-      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
-        nodeClassName = node.className;
-        if (nodeClassName.length == 0) continue;
-        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
-          results.push(node);
+      for ( var i = 0, elem; (elem = curLoop[i]) != null; i++ ) {
+        if ( elem ) {
+          if ( not ^ (elem.className && (" " + elem.className + " ").indexOf(match) >= 0) ) {
+            if ( !inplace )
+              result.push( elem );
+          } else if ( inplace ) {
+            curLoop[i] = false;
+          }
+        }
       }
-      return results;
+
+      return false;
     },
+    ID: function(match){
+      return match[1].replace(/\\/g, "");
+    },
+    TAG: function(match, curLoop){
+      for ( var i = 0; curLoop[i] === false; i++ ){}
+      return curLoop[i] && isXML(curLoop[i]) ? match[1] : match[1].toUpperCase();
+    },
+    CHILD: function(match){
+      if ( match[1] == "nth" ) {
+        var test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
+          match[2] == "even" && "2n" || match[2] == "odd" && "2n+1" ||
+          !/\D/.test( match[2] ) && "0n+" + match[2] || match[2]);
+
+        match[2] = (test[1] + (test[2] || 1)) - 0;
+        match[3] = test[3] - 0;
+      }
 
-    attrPresence: function(nodes, root, attr, combinator) {
-      if (!nodes) nodes = root.getElementsByTagName("*");
-      if (nodes && combinator) nodes = this[combinator](nodes);
-      var results = [];
-      for (var i = 0, node; node = nodes[i]; i++)
-        if (Element.hasAttribute(node, attr)) results.push(node);
-      return results;
+      match[0] = done++;
+
+      return match;
     },
+    ATTR: function(match, curLoop, inplace, result, not, isXML){
+      var name = match[1].replace(/\\/g, "");
 
-    attr: function(nodes, root, attr, value, operator, combinator) {
-      if (!nodes) nodes = root.getElementsByTagName("*");
-      if (nodes && combinator) nodes = this[combinator](nodes);
-      var handler = Selector.operators[operator], results = [];
-      for (var i = 0, node; node = nodes[i]; i++) {
-        var nodeValue = Element.readAttribute(node, attr);
-        if (nodeValue === null) continue;
-        if (handler(nodeValue, value)) results.push(node);
+      if ( !isXML && Expr.attrMap[name] ) {
+        match[1] = Expr.attrMap[name];
       }
-      return results;
+
+      if ( match[2] === "~=" ) {
+        match[4] = " " + match[4] + " ";
+      }
+
+      return match;
     },
+    PSEUDO: function(match, curLoop, inplace, result, not){
+      if ( match[1] === "not" ) {
+        if ( ( chunker.exec(match[3]) || "" ).length > 1 || /^\w/.test(match[3]) ) {
+          match[3] = Sizzle(match[3], null, null, curLoop);
+        } else {
+          var ret = Sizzle.filter(match[3], curLoop, inplace, true ^ not);
+          if ( !inplace ) {
+            result.push.apply( result, ret );
+          }
+          return false;
+        }
+      } else if ( Expr.match.POS.test( match[0] ) || Expr.match.CHILD.test( match[0] ) ) {
+        return true;
+      }
 
-    pseudo: function(nodes, name, value, root, combinator) {
-      if (nodes && combinator) nodes = this[combinator](nodes);
-      if (!nodes) nodes = root.getElementsByTagName("*");
-      return Selector.pseudos[name](nodes, value, root);
+      return match;
+    },
+    POS: function(match){
+      match.unshift( true );
+      return match;
     }
   },
-
-  pseudos: {
-    'first-child': function(nodes, value, root) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++) {
-        if (Selector.handlers.previousElementSibling(node)) continue;
-          results.push(node);
-      }
-      return results;
+  filters: {
+    enabled: function(elem){
+      return elem.disabled === false && elem.type !== "hidden";
     },
-    'last-child': function(nodes, value, root) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++) {
-        if (Selector.handlers.nextElementSibling(node)) continue;
-          results.push(node);
-      }
-      return results;
+    disabled: function(elem){
+      return elem.disabled === true;
     },
-    'only-child': function(nodes, value, root) {
-      var h = Selector.handlers;
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
-          results.push(node);
-      return results;
+    checked: function(elem){
+      return elem.checked === true;
     },
-    'nth-child':        function(nodes, formula, root) {
-      return Selector.pseudos.nth(nodes, formula, root);
+    selected: function(elem){
+      elem.parentNode.selectedIndex;
+      return elem.selected === true;
     },
-    'nth-last-child':   function(nodes, formula, root) {
-      return Selector.pseudos.nth(nodes, formula, root, true);
+    parent: function(elem){
+      return !!elem.firstChild;
     },
-    'nth-of-type':      function(nodes, formula, root) {
-      return Selector.pseudos.nth(nodes, formula, root, false, true);
+    empty: function(elem){
+      return !elem.firstChild;
     },
-    'nth-last-of-type': function(nodes, formula, root) {
-      return Selector.pseudos.nth(nodes, formula, root, true, true);
+    has: function(elem, i, match){
+      return !!Sizzle( match[3], elem ).length;
     },
-    'first-of-type':    function(nodes, formula, root) {
-      return Selector.pseudos.nth(nodes, "1", root, false, true);
+    header: function(elem){
+      return /h\d/i.test( elem.nodeName );
     },
-    'last-of-type':     function(nodes, formula, root) {
-      return Selector.pseudos.nth(nodes, "1", root, true, true);
+    text: function(elem){
+      return "text" === elem.type;
     },
-    'only-of-type':     function(nodes, formula, root) {
-      var p = Selector.pseudos;
-      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
+    radio: function(elem){
+      return "radio" === elem.type;
     },
-
-    // handles the an+b logic
-    getIndices: function(a, b, total) {
-      if (a == 0) return b > 0 ? [b] : [];
-      return $R(1, total).inject([], function(memo, i) {
-        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
-        return memo;
-      });
+    checkbox: function(elem){
+      return "checkbox" === elem.type;
+    },
+    file: function(elem){
+      return "file" === elem.type;
+    },
+    password: function(elem){
+      return "password" === elem.type;
+    },
+    submit: function(elem){
+      return "submit" === elem.type;
+    },
+    image: function(elem){
+      return "image" === elem.type;
+    },
+    reset: function(elem){
+      return "reset" === elem.type;
+    },
+    button: function(elem){
+      return "button" === elem.type || elem.nodeName.toUpperCase() === "BUTTON";
+    },
+    input: function(elem){
+      return /input|select|textarea|button/i.test(elem.nodeName);
+    }
+  },
+  setFilters: {
+    first: function(elem, i){
+      return i === 0;
+    },
+    last: function(elem, i, match, array){
+      return i === array.length - 1;
+    },
+    even: function(elem, i){
+      return i % 2 === 0;
+    },
+    odd: function(elem, i){
+      return i % 2 === 1;
+    },
+    lt: function(elem, i, match){
+      return i < match[3] - 0;
+    },
+    gt: function(elem, i, match){
+      return i > match[3] - 0;
+    },
+    nth: function(elem, i, match){
+      return match[3] - 0 == i;
     },
+    eq: function(elem, i, match){
+      return match[3] - 0 == i;
+    }
+  },
+  filter: {
+    PSEUDO: function(elem, match, i, array){
+      var name = match[1], filter = Expr.filters[ name ];
 
-    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
-    nth: function(nodes, formula, root, reverse, ofType) {
-      if (nodes.length == 0) return [];
-      if (formula == 'even') formula = '2n+0';
-      if (formula == 'odd')  formula = '2n+1';
-      var h = Selector.handlers, results = [], indexed = [], m;
-      h.mark(nodes);
-      for (var i = 0, node; node = nodes[i]; i++) {
-        if (!node.parentNode._countedByPrototype) {
-          h.index(node.parentNode, reverse, ofType);
-          indexed.push(node.parentNode);
-        }
-      }
-      if (formula.match(/^\d+$/)) { // just a number
-        formula = Number(formula);
-        for (var i = 0, node; node = nodes[i]; i++)
-          if (node.nodeIndex == formula) results.push(node);
-      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
-        if (m[1] == "-") m[1] = -1;
-        var a = m[1] ? Number(m[1]) : 1;
-        var b = m[2] ? Number(m[2]) : 0;
-        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
-        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
-          for (var j = 0; j < l; j++)
-            if (node.nodeIndex == indices[j]) results.push(node);
+      if ( filter ) {
+        return filter( elem, i, match, array );
+      } else if ( name === "contains" ) {
+        return (elem.textContent || elem.innerText || "").indexOf(match[3]) >= 0;
+      } else if ( name === "not" ) {
+        var not = match[3];
+
+        for ( var i = 0, l = not.length; i < l; i++ ) {
+          if ( not[i] === elem ) {
+            return false;
+          }
         }
+
+        return true;
       }
-      h.unmark(nodes);
-      h.unmark(indexed);
-      return results;
     },
+    CHILD: function(elem, match){
+      var type = match[1], node = elem;
+      switch (type) {
+        case 'only':
+        case 'first':
+          while ( (node = node.previousSibling) )  {
+            if ( node.nodeType === 1 ) return false;
+          }
+          if ( type == 'first') return true;
+          node = elem;
+        case 'last':
+          while ( (node = node.nextSibling) )  {
+            if ( node.nodeType === 1 ) return false;
+          }
+          return true;
+        case 'nth':
+          var first = match[2], last = match[3];
+
+          if ( first == 1 && last == 0 ) {
+            return true;
+          }
+
+          var doneName = match[0],
+            parent = elem.parentNode;
 
-    'empty': function(nodes, value, root) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++) {
-        // IE treats comments as element nodes
-        if (node.tagName == '!' || node.firstChild) continue;
-        results.push(node);
+          if ( parent && (parent.sizcache !== doneName || !elem.nodeIndex) ) {
+            var count = 0;
+            for ( node = parent.firstChild; node; node = node.nextSibling ) {
+              if ( node.nodeType === 1 ) {
+                node.nodeIndex = ++count;
+              }
+            }
+            parent.sizcache = doneName;
+          }
+
+          var diff = elem.nodeIndex - last;
+          if ( first == 0 ) {
+            return diff == 0;
+          } else {
+            return ( diff % first == 0 && diff / first >= 0 );
+          }
       }
-      return results;
     },
-
-    'not': function(nodes, selector, root) {
-      var h = Selector.handlers, selectorType, m;
-      var exclusions = new Selector(selector).findElements(root);
-      h.mark(exclusions);
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        if (!node._countedByPrototype) results.push(node);
-      h.unmark(exclusions);
-      return results;
+    ID: function(elem, match){
+      return elem.nodeType === 1 && elem.getAttribute("id") === match;
     },
-
-    'enabled': function(nodes, value, root) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        if (!node.disabled && (!node.type || node.type !== 'hidden'))
-          results.push(node);
-      return results;
+    TAG: function(elem, match){
+      return (match === "*" && elem.nodeType === 1) || elem.nodeName === match;
     },
-
-    'disabled': function(nodes, value, root) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        if (node.disabled) results.push(node);
-      return results;
+    CLASS: function(elem, match){
+      return (" " + (elem.className || elem.getAttribute("class")) + " ")
+        .indexOf( match ) > -1;
+    },
+    ATTR: function(elem, match){
+      var name = match[1],
+        result = Expr.attrHandle[ name ] ?
+          Expr.attrHandle[ name ]( elem ) :
+          elem[ name ] != null ?
+            elem[ name ] :
+            elem.getAttribute( name ),
+        value = result + "",
+        type = match[2],
+        check = match[4];
+
+      return result == null ?
+        type === "!=" :
+        type === "=" ?
+        value === check :
+        type === "*=" ?
+        value.indexOf(check) >= 0 :
+        type === "~=" ?
+        (" " + value + " ").indexOf(check) >= 0 :
+        !check ?
+        value && result !== false :
+        type === "!=" ?
+        value != check :
+        type === "^=" ?
+        value.indexOf(check) === 0 :
+        type === "$=" ?
+        value.substr(value.length - check.length) === check :
+        type === "|=" ?
+        value === check || value.substr(0, check.length + 1) === check + "-" :
+        false;
     },
+    POS: function(elem, match, i, array){
+      var name = match[2], filter = Expr.setFilters[ name ];
 
-    'checked': function(nodes, value, root) {
-      for (var i = 0, results = [], node; node = nodes[i]; i++)
-        if (node.checked) results.push(node);
-      return results;
+      if ( filter ) {
+        return filter( elem, i, match, array );
+      }
     }
-  },
+  }
+};
 
-  operators: {
-    '=':  function(nv, v) { return nv == v; },
-    '!=': function(nv, v) { return nv != v; },
-    '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
-    '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
-    '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
-    '$=': function(nv, v) { return nv.endsWith(v); },
-    '*=': function(nv, v) { return nv.include(v); },
-    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
-    '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
-     '-').include('-' + (v || "").toUpperCase() + '-'); }
-  },
+var origPOS = Expr.match.POS;
 
-  split: function(expression) {
-    var expressions = [];
-    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
-      expressions.push(m[1].strip());
-    });
-    return expressions;
-  },
+for ( var type in Expr.match ) {
+  Expr.match[ type ] = new RegExp( Expr.match[ type ].source + /(?![^\[]*\])(?![^\(]*\))/.source );
+  Expr.leftMatch[ type ] = new RegExp( /(^(?:.|\r|\n)*?)/.source + Expr.match[ type ].source );
+}
+
+var makeArray = function(array, results) {
+  array = Array.prototype.slice.call( array, 0 );
 
-  matchElements: function(elements, expression) {
-    var matches = $$(expression), h = Selector.handlers;
-    h.mark(matches);
-    for (var i = 0, results = [], element; element = elements[i]; i++)
-      if (element._countedByPrototype) results.push(element);
-    h.unmark(matches);
+  if ( results ) {
+    results.push.apply( results, array );
     return results;
-  },
+  }
+
+  return array;
+};
+
+try {
+  Array.prototype.slice.call( document.documentElement.childNodes, 0 );
 
-  findElement: function(elements, expression, index) {
-    if (Object.isNumber(expression)) {
-      index = expression; expression = false;
+} catch(e){
+  makeArray = function(array, results) {
+    var ret = results || [];
+
+    if ( toString.call(array) === "[object Array]" ) {
+      Array.prototype.push.apply( ret, array );
+    } else {
+      if ( typeof array.length === "number" ) {
+        for ( var i = 0, l = array.length; i < l; i++ ) {
+          ret.push( array[i] );
+        }
+      } else {
+        for ( var i = 0; array[i]; i++ ) {
+          ret.push( array[i] );
+        }
+      }
     }
-    return Selector.matchElements(elements, expression || '*')[index || 0];
-  },
 
-  findChildElements: function(element, expressions) {
-    expressions = Selector.split(expressions.join(','));
-    var results = [], h = Selector.handlers;
-    for (var i = 0, l = expressions.length, selector; i < l; i++) {
-      selector = new Selector(expressions[i].strip());
-      h.concat(results, selector.findElements(element));
+    return ret;
+  };
+}
+
+var sortOrder;
+
+if ( document.documentElement.compareDocumentPosition ) {
+  sortOrder = function( a, b ) {
+    if ( !a.compareDocumentPosition || !b.compareDocumentPosition ) {
+      if ( a == b ) {
+        hasDuplicate = true;
+      }
+      return 0;
+    }
+
+    var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;
+    if ( ret === 0 ) {
+      hasDuplicate = true;
+    }
+    return ret;
+  };
+} else if ( "sourceIndex" in document.documentElement ) {
+  sortOrder = function( a, b ) {
+    if ( !a.sourceIndex || !b.sourceIndex ) {
+      if ( a == b ) {
+        hasDuplicate = true;
+      }
+      return 0;
+    }
+
+    var ret = a.sourceIndex - b.sourceIndex;
+    if ( ret === 0 ) {
+      hasDuplicate = true;
+    }
+    return ret;
+  };
+} else if ( document.createRange ) {
+  sortOrder = function( a, b ) {
+    if ( !a.ownerDocument || !b.ownerDocument ) {
+      if ( a == b ) {
+        hasDuplicate = true;
+      }
+      return 0;
+    }
+
+    var aRange = a.ownerDocument.createRange(), bRange = b.ownerDocument.createRange();
+    aRange.setStart(a, 0);
+    aRange.setEnd(a, 0);
+    bRange.setStart(b, 0);
+    bRange.setEnd(b, 0);
+    var ret = aRange.compareBoundaryPoints(Range.START_TO_END, bRange);
+    if ( ret === 0 ) {
+      hasDuplicate = true;
     }
-    return (l > 1) ? h.unique(results) : results;
+    return ret;
+  };
+}
+
+(function(){
+  var form = document.createElement("div"),
+    id = "script" + (new Date).getTime();
+  form.innerHTML = "<a name='" + id + "'/>";
+
+  var root = document.documentElement;
+  root.insertBefore( form, root.firstChild );
+
+  if ( !!document.getElementById( id ) ) {
+    Expr.find.ID = function(match, context, isXML){
+      if ( typeof context.getElementById !== "undefined" && !isXML ) {
+        var m = context.getElementById(match[1]);
+        return m ? m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
+      }
+    };
+
+    Expr.filter.ID = function(elem, match){
+      var node = typeof elem.getAttributeNode !== "undefined" && elem.getAttributeNode("id");
+      return elem.nodeType === 1 && node && node.nodeValue === match;
+    };
   }
-});
 
-if (Prototype.Browser.IE) {
-  Object.extend(Selector.handlers, {
-    // IE returns comment nodes on getElementsByTagName("*").
-    // Filter them out.
-    concat: function(a, b) {
-      for (var i = 0, node; node = b[i]; i++)
-        if (node.tagName !== "!") a.push(node);
-      return a;
-    },
+  root.removeChild( form );
+  root = form = null; // release memory in IE
+})();
+
+(function(){
+
+  var div = document.createElement("div");
+  div.appendChild( document.createComment("") );
+
+  if ( div.getElementsByTagName("*").length > 0 ) {
+    Expr.find.TAG = function(match, context){
+      var results = context.getElementsByTagName(match[1]);
+
+      if ( match[1] === "*" ) {
+        var tmp = [];
+
+        for ( var i = 0; results[i]; i++ ) {
+          if ( results[i].nodeType === 1 ) {
+            tmp.push( results[i] );
+          }
+        }
+
+        results = tmp;
+      }
+
+      return results;
+    };
+  }
 
-    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
-    unmark: function(nodes) {
-      for (var i = 0, node; node = nodes[i]; i++)
-        node.removeAttribute('_countedByPrototype');
-      return nodes;
+  div.innerHTML = "<a href='#'></a>";
+  if ( div.firstChild && typeof div.firstChild.getAttribute !== "undefined" &&
+      div.firstChild.getAttribute("href") !== "#" ) {
+    Expr.attrHandle.href = function(elem){
+      return elem.getAttribute("href", 2);
+    };
+  }
+
+  div = null; // release memory in IE
+})();
+
+if ( document.querySelectorAll ) (function(){
+  var oldSizzle = Sizzle, div = document.createElement("div");
+  div.innerHTML = "<p class='TEST'></p>";
+
+  if ( div.querySelectorAll && div.querySelectorAll(".TEST").length === 0 ) {
+    return;
+  }
+
+  Sizzle = function(query, context, extra, seed){
+    context = context || document;
+
+    if ( !seed && context.nodeType === 9 && !isXML(context) ) {
+      try {
+        return makeArray( context.querySelectorAll(query), extra );
+      } catch(e){}
     }
-  });
+
+    return oldSizzle(query, context, extra, seed);
+  };
+
+  for ( var prop in oldSizzle ) {
+    Sizzle[ prop ] = oldSizzle[ prop ];
+  }
+
+  div = null; // release memory in IE
+})();
+
+if ( document.getElementsByClassName && document.documentElement.getElementsByClassName ) (function(){
+  var div = document.createElement("div");
+  div.innerHTML = "<div class='test e'></div><div class='test'></div>";
+
+  if ( div.getElementsByClassName("e").length === 0 )
+    return;
+
+  div.lastChild.className = "e";
+
+  if ( div.getElementsByClassName("e").length === 1 )
+    return;
+
+  Expr.order.splice(1, 0, "CLASS");
+  Expr.find.CLASS = function(match, context, isXML) {
+    if ( typeof context.getElementsByClassName !== "undefined" && !isXML ) {
+      return context.getElementsByClassName(match[1]);
+    }
+  };
+
+  div = null; // release memory in IE
+})();
+
+function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
+  var sibDir = dir == "previousSibling" && !isXML;
+  for ( var i = 0, l = checkSet.length; i < l; i++ ) {
+    var elem = checkSet[i];
+    if ( elem ) {
+      if ( sibDir && elem.nodeType === 1 ){
+        elem.sizcache = doneName;
+        elem.sizset = i;
+      }
+      elem = elem[dir];
+      var match = false;
+
+      while ( elem ) {
+        if ( elem.sizcache === doneName ) {
+          match = checkSet[elem.sizset];
+          break;
+        }
+
+        if ( elem.nodeType === 1 && !isXML ){
+          elem.sizcache = doneName;
+          elem.sizset = i;
+        }
+
+        if ( elem.nodeName === cur ) {
+          match = elem;
+          break;
+        }
+
+        elem = elem[dir];
+      }
+
+      checkSet[i] = match;
+    }
+  }
 }
 
-function $$() {
-  return Selector.findChildElements(document, $A(arguments));
+function dirCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
+  var sibDir = dir == "previousSibling" && !isXML;
+  for ( var i = 0, l = checkSet.length; i < l; i++ ) {
+    var elem = checkSet[i];
+    if ( elem ) {
+      if ( sibDir && elem.nodeType === 1 ) {
+        elem.sizcache = doneName;
+        elem.sizset = i;
+      }
+      elem = elem[dir];
+      var match = false;
+
+      while ( elem ) {
+        if ( elem.sizcache === doneName ) {
+          match = checkSet[elem.sizset];
+          break;
+        }
+
+        if ( elem.nodeType === 1 ) {
+          if ( !isXML ) {
+            elem.sizcache = doneName;
+            elem.sizset = i;
+          }
+          if ( typeof cur !== "string" ) {
+            if ( elem === cur ) {
+              match = true;
+              break;
+            }
+
+          } else if ( Sizzle.filter( cur, [elem] ).length > 0 ) {
+            match = elem;
+            break;
+          }
+        }
+
+        elem = elem[dir];
+      }
+
+      checkSet[i] = match;
+    }
+  }
 }
+
+var contains = document.compareDocumentPosition ?  function(a, b){
+  return a.compareDocumentPosition(b) & 16;
+} : function(a, b){
+  return a !== b && (a.contains ? a.contains(b) : true);
+};
+
+var isXML = function(elem){
+  return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
+    !!elem.ownerDocument && elem.ownerDocument.documentElement.nodeName !== "HTML";
+};
+
+var posProcess = function(selector, context){
+  var tmpSet = [], later = "", match,
+    root = context.nodeType ? [context] : context;
+
+  while ( (match = Expr.match.PSEUDO.exec( selector )) ) {
+    later += match[0];
+    selector = selector.replace( Expr.match.PSEUDO, "" );
+  }
+
+  selector = Expr.relative[selector] ? selector + "*" : selector;
+
+  for ( var i = 0, l = root.length; i < l; i++ ) {
+    Sizzle( selector, root[i], tmpSet );
+  }
+
+  return Sizzle.filter( later, tmpSet );
+};
+
+
+window.Sizzle = Sizzle;
+
+})();
+
+;(function(engine) {
+  var extendElements = Prototype.Selector.extendElements;
+
+  function select(selector, scope) {
+    return extendElements(engine(selector, scope || document));
+  }
+
+  function match(element, selector) {
+    return engine.matches(selector, [element]).length == 1;
+  }
+
+  Prototype.Selector.engine = engine;
+  Prototype.Selector.select = select;
+  Prototype.Selector.match = match;
+})(Sizzle);
+
+window.Sizzle = Prototype._original_property;
+delete Prototype._original_property;
+
 var Form = {
   reset: function(form) {
-    $(form).reset();
+    form = $(form);
+    form.reset();
     return form;
   },
 
   serializeElements: function(elements, options) {
     if (typeof options != 'object') options = { hash: !!options };
     else if (Object.isUndefined(options.hash)) options.hash = true;
-    var key, value, submitted = false, submit = options.submit;
+    var key, value, submitted = false, submit = options.submit, accumulator, initial;
+
+    if (options.hash) {
+      initial = {};
+      accumulator = function(result, key, value) {
+        if (key in result) {
+          if (!Object.isArray(result[key])) result[key] = [result[key]];
+          result[key].push(value);
+        } else result[key] = value;
+        return result;
+      };
+    } else {
+      initial = '';
+      accumulator = function(result, key, value) {
+        return result + (result ? '&' : '') + encodeURIComponent(key) + '=' + encodeURIComponent(value);
+      }
+    }
 
-    var data = elements.inject({ }, function(result, element) {
+    return elements.inject(initial, function(result, element) {
       if (!element.disabled && element.name) {
         key = element.name; value = $(element).getValue();
         if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
             submit !== false && (!submit || key == submit) && (submitted = true)))) {
-          if (key in result) {
-            // a key is already present; construct an array of values
-            if (!Object.isArray(result[key])) result[key] = [result[key]];
-            result[key].push(value);
-          }
-          else result[key] = value;
+          result = accumulator(result, key, value);
         }
       }
       return result;
     });
-
-    return options.hash ? data : Object.toQueryString(data);
   }
 };
 
@@ -3480,13 +5007,18 @@ Form.Methods = {
   },
 
   getElements: function(form) {
-    return $A($(form).getElementsByTagName('*')).inject([],
-      function(elements, child) {
-        if (Form.Element.Serializers[child.tagName.toLowerCase()])
-          elements.push(Element.extend(child));
-        return elements;
-      }
-    );
+    var elements = $(form).getElementsByTagName('*'),
+        element,
+        arr = [ ],
+        serializers = Form.Element.Serializers;
+    for (var i = 0; element = elements[i]; i++) {
+      arr.push(element);
+    }
+    return arr.inject([], function(elements, child) {
+      if (serializers[child.tagName.toLowerCase()])
+        elements.push(Element.extend(child));
+      return elements;
+    })
   },
 
   getInputs: function(form, typeName, name) {
@@ -3526,13 +5058,14 @@ Form.Methods = {
     }).sortBy(function(element) { return element.tabIndex }).first();
 
     return firstByIndex ? firstByIndex : elements.find(function(element) {
-      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
+      return /^(?:input|select|textarea)$/i.test(element.tagName);
     });
   },
 
   focusFirstElement: function(form) {
     form = $(form);
-    form.findFirstElement().activate();
+    var element = form.findFirstElement();
+    if (element) element.activate();
     return form;
   },
 
@@ -3557,6 +5090,7 @@ Form.Methods = {
 
 /*--------------------------------------------------------------------------*/
 
+
 Form.Element = {
   focus: function(element) {
     $(element).focus();
@@ -3570,6 +5104,7 @@ Form.Element = {
 };
 
 Form.Element.Methods = {
+
   serialize: function(element) {
     element = $(element);
     if (!element.disabled && element.name) {
@@ -3610,7 +5145,7 @@ Form.Element.Methods = {
     try {
       element.focus();
       if (element.select && (element.tagName.toLowerCase() != 'input' ||
-          !['button', 'reset', 'submit'].include(element.type)))
+          !(/^(?:button|reset|submit)$/i.test(element.type))))
         element.select();
     } catch (e) { }
     return element;
@@ -3632,75 +5167,86 @@ Form.Element.Methods = {
 /*--------------------------------------------------------------------------*/
 
 var Field = Form.Element;
+
 var $F = Form.Element.Methods.getValue;
 
 /*--------------------------------------------------------------------------*/
 
-Form.Element.Serializers = {
-  input: function(element, value) {
+Form.Element.Serializers = (function() {
+  function input(element, value) {
     switch (element.type.toLowerCase()) {
       case 'checkbox':
       case 'radio':
-        return Form.Element.Serializers.inputSelector(element, value);
+        return inputSelector(element, value);
       default:
-        return Form.Element.Serializers.textarea(element, value);
+        return valueSelector(element, value);
     }
-  },
+  }
 
-  inputSelector: function(element, value) {
-    if (Object.isUndefined(value)) return element.checked ? element.value : null;
+  function inputSelector(element, value) {
+    if (Object.isUndefined(value))
+      return element.checked ? element.value : null;
     else element.checked = !!value;
-  },
+  }
 
-  textarea: function(element, value) {
+  function valueSelector(element, value) {
     if (Object.isUndefined(value)) return element.value;
     else element.value = value;
-  },
+  }
 
-  select: function(element, value) {
+  function select(element, value) {
     if (Object.isUndefined(value))
-      return this[element.type == 'select-one' ?
-        'selectOne' : 'selectMany'](element);
-    else {
-      var opt, currentValue, single = !Object.isArray(value);
-      for (var i = 0, length = element.length; i < length; i++) {
-        opt = element.options[i];
-        currentValue = this.optionValue(opt);
-        if (single) {
-          if (currentValue == value) {
-            opt.selected = true;
-            return;
-          }
+      return (element.type === 'select-one' ? selectOne : selectMany)(element);
+
+    var opt, currentValue, single = !Object.isArray(value);
+    for (var i = 0, length = element.length; i < length; i++) {
+      opt = element.options[i];
+      currentValue = this.optionValue(opt);
+      if (single) {
+        if (currentValue == value) {
+          opt.selected = true;
+          return;
         }
-        else opt.selected = value.include(currentValue);
       }
+      else opt.selected = value.include(currentValue);
     }
-  },
+  }
 
-  selectOne: function(element) {
+  function selectOne(element) {
     var index = element.selectedIndex;
-    return index >= 0 ? this.optionValue(element.options[index]) : null;
-  },
+    return index >= 0 ? optionValue(element.options[index]) : null;
+  }
 
-  selectMany: function(element) {
+  function selectMany(element) {
     var values, length = element.length;
     if (!length) return null;
 
     for (var i = 0, values = []; i < length; i++) {
       var opt = element.options[i];
-      if (opt.selected) values.push(this.optionValue(opt));
+      if (opt.selected) values.push(optionValue(opt));
     }
     return values;
-  },
+  }
 
-  optionValue: function(opt) {
-    // extend element because hasAttribute may not be native
-    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
+  function optionValue(opt) {
+    return Element.hasAttribute(opt, 'value') ? opt.value : opt.text;
   }
-};
+
+  return {
+    input:         input,
+    inputSelector: inputSelector,
+    textarea:      valueSelector,
+    select:        select,
+    selectOne:     selectOne,
+    selectMany:    selectMany,
+    optionValue:   optionValue,
+    button:        valueSelector
+  };
+})();
 
 /*--------------------------------------------------------------------------*/
 
+
 Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
   initialize: function($super, element, frequency, callback) {
     $super(callback, frequency);
@@ -3782,354 +5328,527 @@ Form.EventObserver = Class.create(Abstract.EventObserver, {
     return Form.serialize(this.element);
   }
 });
-if (!window.Event) var Event = { };
-
-Object.extend(Event, {
-  KEY_BACKSPACE: 8,
-  KEY_TAB:       9,
-  KEY_RETURN:   13,
-  KEY_ESC:      27,
-  KEY_LEFT:     37,
-  KEY_UP:       38,
-  KEY_RIGHT:    39,
-  KEY_DOWN:     40,
-  KEY_DELETE:   46,
-  KEY_HOME:     36,
-  KEY_END:      35,
-  KEY_PAGEUP:   33,
-  KEY_PAGEDOWN: 34,
-  KEY_INSERT:   45,
-
-  cache: { },
-
-  relatedTarget: function(event) {
-    var element;
-    switch(event.type) {
-      case 'mouseover': element = event.fromElement; break;
-      case 'mouseout':  element = event.toElement;   break;
-      default: return null;
-    }
-    return Element.extend(element);
+(function() {
+
+  var Event = {
+    KEY_BACKSPACE: 8,
+    KEY_TAB:       9,
+    KEY_RETURN:   13,
+    KEY_ESC:      27,
+    KEY_LEFT:     37,
+    KEY_UP:       38,
+    KEY_RIGHT:    39,
+    KEY_DOWN:     40,
+    KEY_DELETE:   46,
+    KEY_HOME:     36,
+    KEY_END:      35,
+    KEY_PAGEUP:   33,
+    KEY_PAGEDOWN: 34,
+    KEY_INSERT:   45,
+
+    cache: {}
+  };
+
+  var docEl = document.documentElement;
+  var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
+    && 'onmouseleave' in docEl;
+
+
+
+  var isIELegacyEvent = function(event) { return false; };
+
+  if (window.attachEvent) {
+    if (window.addEventListener) {
+      isIELegacyEvent = function(event) {
+        return !(event instanceof window.Event);
+      };
+    } else {
+      isIELegacyEvent = function(event) { return true; };
+    }
   }
-});
 
-Event.Methods = (function() {
-  var isButton;
+  var _isButton;
 
-  if (Prototype.Browser.IE) {
-    var buttonMap = { 0: 1, 1: 4, 2: 2 };
-    isButton = function(event, code) {
-      return event.button == buttonMap[code];
-    };
+  function _isButtonForDOMEvents(event, code) {
+    return event.which ? (event.which === code + 1) : (event.button === code);
+  }
 
-  } else if (Prototype.Browser.WebKit) {
-    isButton = function(event, code) {
-      switch (code) {
-        case 0: return event.which == 1 && !event.metaKey;
-        case 1: return event.which == 1 && event.metaKey;
-        default: return false;
-      }
-    };
+  var legacyButtonMap = { 0: 1, 1: 4, 2: 2 };
+  function _isButtonForLegacyEvents(event, code) {
+    return event.button === legacyButtonMap[code];
+  }
 
-  } else {
-    isButton = function(event, code) {
-      return event.which ? (event.which === code + 1) : (event.button === code);
-    };
+  function _isButtonForWebKit(event, code) {
+    switch (code) {
+      case 0: return event.which == 1 && !event.metaKey;
+      case 1: return event.which == 2 || (event.which == 1 && event.metaKey);
+      case 2: return event.which == 3;
+      default: return false;
+    }
   }
 
-  return {
-    isLeftClick:   function(event) { return isButton(event, 0) },
-    isMiddleClick: function(event) { return isButton(event, 1) },
-    isRightClick:  function(event) { return isButton(event, 2) },
-
-    element: function(event) {
-      event = Event.extend(event);
-
-      var node          = event.target,
-          type          = event.type,
-          currentTarget = event.currentTarget;
-
-      if (currentTarget && currentTarget.tagName) {
-        // Firefox screws up the "click" event when moving between radio buttons
-        // via arrow keys. It also screws up the "load" and "error" events on images,
-        // reporting the document as the target instead of the original image.
-        if (type === 'load' || type === 'error' ||
-          (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
-            && currentTarget.type === 'radio'))
-              node = currentTarget;
+  if (window.attachEvent) {
+    if (!window.addEventListener) {
+      _isButton = _isButtonForLegacyEvents;
+    } else {
+      _isButton = function(event, code) {
+        return isIELegacyEvent(event) ? _isButtonForLegacyEvents(event, code) :
+         _isButtonForDOMEvents(event, code);
       }
-      if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
-      return Element.extend(node);
-    },
+    }
+  } else if (Prototype.Browser.WebKit) {
+    _isButton = _isButtonForWebKit;
+  } else {
+    _isButton = _isButtonForDOMEvents;
+  }
 
-    findElement: function(event, expression) {
-      var element = Event.element(event);
-      if (!expression) return element;
-      var elements = [element].concat(element.ancestors());
-      return Selector.findElement(elements, expression, 0);
-    },
+  function isLeftClick(event)   { return _isButton(event, 0) }
 
-    pointer: function(event) {
-      var docElement = document.documentElement,
-      body = document.body || { scrollLeft: 0, scrollTop: 0 };
-      return {
-        x: event.pageX || (event.clientX +
-          (docElement.scrollLeft || body.scrollLeft) -
-          (docElement.clientLeft || 0)),
-        y: event.pageY || (event.clientY +
-          (docElement.scrollTop || body.scrollTop) -
-          (docElement.clientTop || 0))
-      };
-    },
+  function isMiddleClick(event) { return _isButton(event, 1) }
+
+  function isRightClick(event)  { return _isButton(event, 2) }
 
-    pointerX: function(event) { return Event.pointer(event).x },
-    pointerY: function(event) { return Event.pointer(event).y },
+  function element(event) {
+    event = Event.extend(event);
 
-    stop: function(event) {
-      Event.extend(event);
-      event.preventDefault();
-      event.stopPropagation();
-      event.stopped = true;
+    var node = event.target, type = event.type,
+     currentTarget = event.currentTarget;
+
+    if (currentTarget && currentTarget.tagName) {
+      if (type === 'load' || type === 'error' ||
+        (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
+          && currentTarget.type === 'radio'))
+            node = currentTarget;
+    }
+
+    if (node.nodeType == Node.TEXT_NODE)
+      node = node.parentNode;
+
+    return Element.extend(node);
+  }
+
+  function findElement(event, expression) {
+    var element = Event.element(event);
+
+    if (!expression) return element;
+    while (element) {
+      if (Object.isElement(element) && Prototype.Selector.match(element, expression)) {
+        return Element.extend(element);
+      }
+      element = element.parentNode;
     }
+  }
+
+  function pointer(event) {
+    return { x: pointerX(event), y: pointerY(event) };
+  }
+
+  function pointerX(event) {
+    var docElement = document.documentElement,
+     body = document.body || { scrollLeft: 0 };
+
+    return event.pageX || (event.clientX +
+      (docElement.scrollLeft || body.scrollLeft) -
+      (docElement.clientLeft || 0));
+  }
+
+  function pointerY(event) {
+    var docElement = document.documentElement,
+     body = document.body || { scrollTop: 0 };
+
+    return  event.pageY || (event.clientY +
+       (docElement.scrollTop || body.scrollTop) -
+       (docElement.clientTop || 0));
+  }
+
+
+  function stop(event) {
+    Event.extend(event);
+    event.preventDefault();
+    event.stopPropagation();
+
+    event.stopped = true;
+  }
+
+
+  Event.Methods = {
+    isLeftClick:   isLeftClick,
+    isMiddleClick: isMiddleClick,
+    isRightClick:  isRightClick,
+
+    element:     element,
+    findElement: findElement,
+
+    pointer:  pointer,
+    pointerX: pointerX,
+    pointerY: pointerY,
+
+    stop: stop
   };
-})();
 
-Event.extend = (function() {
   var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
     m[name] = Event.Methods[name].methodize();
     return m;
   });
 
-  if (Prototype.Browser.IE) {
-    Object.extend(methods, {
+  if (window.attachEvent) {
+    function _relatedTarget(event) {
+      var element;
+      switch (event.type) {
+        case 'mouseover':
+        case 'mouseenter':
+          element = event.fromElement;
+          break;
+        case 'mouseout':
+        case 'mouseleave':
+          element = event.toElement;
+          break;
+        default:
+          return null;
+      }
+      return Element.extend(element);
+    }
+
+    var additionalMethods = {
       stopPropagation: function() { this.cancelBubble = true },
       preventDefault:  function() { this.returnValue = false },
-      inspect: function() { return "[object Event]" }
-    });
+      inspect: function() { return '[object Event]' }
+    };
 
-    return function(event) {
+    Event.extend = function(event, element) {
       if (!event) return false;
-      if (event._extendedByPrototype) return event;
 
+      if (!isIELegacyEvent(event)) return event;
+
+      if (event._extendedByPrototype) return event;
       event._extendedByPrototype = Prototype.emptyFunction;
+
       var pointer = Event.pointer(event);
+
       Object.extend(event, {
-        target: event.srcElement,
-        relatedTarget: Event.relatedTarget(event),
+        target: event.srcElement || element,
+        relatedTarget: _relatedTarget(event),
         pageX:  pointer.x,
         pageY:  pointer.y
       });
-      return Object.extend(event, methods);
-    };
 
+      Object.extend(event, methods);
+      Object.extend(event, additionalMethods);
+
+      return event;
+    };
   } else {
-    Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
-    Object.extend(Event.prototype, methods);
-    return Prototype.K;
+    Event.extend = Prototype.K;
   }
-})();
 
-Object.extend(Event, (function() {
-  var cache = Event.cache;
-
-  function getEventID(element) {
-    if (element._prototypeEventID) return element._prototypeEventID[0];
-    arguments.callee.id = arguments.callee.id || 1;
-    return element._prototypeEventID = [++arguments.callee.id];
+  if (window.addEventListener) {
+    Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
+    Object.extend(Event.prototype, methods);
   }
 
-  function getDOMEventName(eventName) {
-    if (eventName && eventName.include(':')) return "dataavailable";
-    return eventName;
-  }
+  function _createResponder(element, eventName, handler) {
+    var registry = Element.retrieve(element, 'prototype_event_registry');
 
-  function getCacheForID(id) {
-    return cache[id] = cache[id] || { };
-  }
+    if (Object.isUndefined(registry)) {
+      CACHE.push(element);
+      registry = Element.retrieve(element, 'prototype_event_registry', $H());
+    }
 
-  function getWrappersForEventName(id, eventName) {
-    var c = getCacheForID(id);
-    return c[eventName] = c[eventName] || [];
-  }
+    var respondersForEvent = registry.get(eventName);
+    if (Object.isUndefined(respondersForEvent)) {
+      respondersForEvent = [];
+      registry.set(eventName, respondersForEvent);
+    }
 
-  function createWrapper(element, eventName, handler) {
-    var id = getEventID(element);
-    var c = getWrappersForEventName(id, eventName);
-    if (c.pluck("handler").include(handler)) return false;
+    if (respondersForEvent.pluck('handler').include(handler)) return false;
 
-    var wrapper = function(event) {
-      if (!Event || !Event.extend ||
-        (event.eventName && event.eventName != eventName))
+    var responder;
+    if (eventName.include(":")) {
+      responder = function(event) {
+        if (Object.isUndefined(event.eventName))
           return false;
 
-      Event.extend(event);
-      handler.call(element, event);
-    };
+        if (event.eventName !== eventName)
+          return false;
 
-    wrapper.handler = handler;
-    c.push(wrapper);
-    return wrapper;
-  }
+        Event.extend(event, element);
+        handler.call(element, event);
+      };
+    } else {
+      if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
+       (eventName === "mouseenter" || eventName === "mouseleave")) {
+        if (eventName === "mouseenter" || eventName === "mouseleave") {
+          responder = function(event) {
+            Event.extend(event, element);
+
+            var parent = event.relatedTarget;
+            while (parent && parent !== element) {
+              try { parent = parent.parentNode; }
+              catch(e) { parent = element; }
+            }
 
-  function findWrapper(id, eventName, handler) {
-    var c = getWrappersForEventName(id, eventName);
-    return c.find(function(wrapper) { return wrapper.handler == handler });
-  }
+            if (parent === element) return;
 
-  function destroyWrapper(id, eventName, handler) {
-    var c = getCacheForID(id);
-    if (!c[eventName]) return false;
-    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
+            handler.call(element, event);
+          };
+        }
+      } else {
+        responder = function(event) {
+          Event.extend(event, element);
+          handler.call(element, event);
+        };
+      }
+    }
+
+    responder.handler = handler;
+    respondersForEvent.push(responder);
+    return responder;
   }
 
-  function destroyCache() {
-    for (var id in cache)
-      for (var eventName in cache[id])
-        cache[id][eventName] = null;
+  function _destroyCache() {
+    for (var i = 0, length = CACHE.length; i < length; i++) {
+      Event.stopObserving(CACHE[i]);
+      CACHE[i] = null;
+    }
   }
 
+  var CACHE = [];
 
-  // Internet Explorer needs to remove event handlers on page unload
-  // in order to avoid memory leaks.
-  if (window.attachEvent) {
-    window.attachEvent("onunload", destroyCache);
-  }
+  if (Prototype.Browser.IE)
+    window.attachEvent('onunload', _destroyCache);
 
-  // Safari has a dummy event handler on page unload so that it won't
-  // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
-  // object when page is returned to via the back button using its bfcache.
-  if (Prototype.Browser.WebKit) {
+  if (Prototype.Browser.WebKit)
     window.addEventListener('unload', Prototype.emptyFunction, false);
+
+
+  var _getDOMEventName = Prototype.K,
+      translations = { mouseenter: "mouseover", mouseleave: "mouseout" };
+
+  if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED) {
+    _getDOMEventName = function(eventName) {
+      return (translations[eventName] || eventName);
+    };
   }
 
-  return {
-    observe: function(element, eventName, handler) {
-      element = $(element);
-      var name = getDOMEventName(eventName);
+  function observe(element, eventName, handler) {
+    element = $(element);
 
-      var wrapper = createWrapper(element, eventName, handler);
-      if (!wrapper) return element;
+    var responder = _createResponder(element, eventName, handler);
 
-      if (element.addEventListener) {
-        element.addEventListener(name, wrapper, false);
-      } else {
-        element.attachEvent("on" + name, wrapper);
+    if (!responder) return element;
+
+    if (eventName.include(':')) {
+      if (element.addEventListener)
+        element.addEventListener("dataavailable", responder, false);
+      else {
+        element.attachEvent("ondataavailable", responder);
+        element.attachEvent("onlosecapture", responder);
       }
+    } else {
+      var actualEventName = _getDOMEventName(eventName);
+
+      if (element.addEventListener)
+        element.addEventListener(actualEventName, responder, false);
+      else
+        element.attachEvent("on" + actualEventName, responder);
+    }
+
+    return element;
+  }
 
+  function stopObserving(element, eventName, handler) {
+    element = $(element);
+
+    var registry = Element.retrieve(element, 'prototype_event_registry');
+    if (!registry) return element;
+
+    if (!eventName) {
+      registry.each( function(pair) {
+        var eventName = pair.key;
+        stopObserving(element, eventName);
+      });
       return element;
-    },
+    }
 
-    stopObserving: function(element, eventName, handler) {
-      element = $(element);
-      var id = getEventID(element), name = getDOMEventName(eventName);
+    var responders = registry.get(eventName);
+    if (!responders) return element;
 
-      if (!handler && eventName) {
-        getWrappersForEventName(id, eventName).each(function(wrapper) {
-          element.stopObserving(eventName, wrapper.handler);
-        });
-        return element;
+    if (!handler) {
+      responders.each(function(r) {
+        stopObserving(element, eventName, r.handler);
+      });
+      return element;
+    }
 
-      } else if (!eventName) {
-        Object.keys(getCacheForID(id)).each(function(eventName) {
-          element.stopObserving(eventName);
-        });
-        return element;
+    var i = responders.length, responder;
+    while (i--) {
+      if (responders[i].handler === handler) {
+        responder = responders[i];
+        break;
+      }
+    }
+    if (!responder) return element;
+
+    if (eventName.include(':')) {
+      if (element.removeEventListener)
+        element.removeEventListener("dataavailable", responder, false);
+      else {
+        element.detachEvent("ondataavailable", responder);
+        element.detachEvent("onlosecapture", responder);
       }
+    } else {
+      var actualEventName = _getDOMEventName(eventName);
+      if (element.removeEventListener)
+        element.removeEventListener(actualEventName, responder, false);
+      else
+        element.detachEvent('on' + actualEventName, responder);
+    }
 
-      var wrapper = findWrapper(id, eventName, handler);
-      if (!wrapper) return element;
+    registry.set(eventName, responders.without(responder));
 
-      if (element.removeEventListener) {
-        element.removeEventListener(name, wrapper, false);
-      } else {
-        element.detachEvent("on" + name, wrapper);
-      }
+    return element;
+  }
 
-      destroyWrapper(id, eventName, handler);
+  function fire(element, eventName, memo, bubble) {
+    element = $(element);
 
-      return element;
-    },
+    if (Object.isUndefined(bubble))
+      bubble = true;
 
-    fire: function(element, eventName, memo) {
-      element = $(element);
-      if (element == document && document.createEvent && !element.dispatchEvent)
-        element = document.documentElement;
+    if (element == document && document.createEvent && !element.dispatchEvent)
+      element = document.documentElement;
 
-      var event;
-      if (document.createEvent) {
-        event = document.createEvent("HTMLEvents");
-        event.initEvent("dataavailable", true, true);
-      } else {
-        event = document.createEventObject();
-        event.eventType = "ondataavailable";
-      }
+    var event;
+    if (document.createEvent) {
+      event = document.createEvent('HTMLEvents');
+      event.initEvent('dataavailable', bubble, true);
+    } else {
+      event = document.createEventObject();
+      event.eventType = bubble ? 'ondataavailable' : 'onlosecapture';
+    }
 
-      event.eventName = eventName;
-      event.memo = memo || { };
+    event.eventName = eventName;
+    event.memo = memo || { };
 
-      if (document.createEvent) {
-        element.dispatchEvent(event);
-      } else {
-        element.fireEvent(event.eventType, event);
-      }
+    if (document.createEvent)
+      element.dispatchEvent(event);
+    else
+      element.fireEvent(event.eventType, event);
+
+    return Event.extend(event);
+  }
 
-      return Event.extend(event);
+  Event.Handler = Class.create({
+    initialize: function(element, eventName, selector, callback) {
+      this.element   = $(element);
+      this.eventName = eventName;
+      this.selector  = selector;
+      this.callback  = callback;
+      this.handler   = this.handleEvent.bind(this);
+    },
+
+    start: function() {
+      Event.observe(this.element, this.eventName, this.handler);
+      return this;
+    },
+
+    stop: function() {
+      Event.stopObserving(this.element, this.eventName, this.handler);
+      return this;
+    },
+
+    handleEvent: function(event) {
+      var element = Event.findElement(event, this.selector);
+      if (element) this.callback.call(this.element, event, element);
     }
-  };
-})());
+  });
 
-Object.extend(Event, Event.Methods);
+  function on(element, eventName, selector, callback) {
+    element = $(element);
+    if (Object.isFunction(selector) && Object.isUndefined(callback)) {
+      callback = selector, selector = null;
+    }
 
-Element.addMethods({
-  fire:          Event.fire,
-  observe:       Event.observe,
-  stopObserving: Event.stopObserving
-});
+    return new Event.Handler(element, eventName, selector, callback).start();
+  }
 
-Object.extend(document, {
-  fire:          Element.Methods.fire.methodize(),
-  observe:       Element.Methods.observe.methodize(),
-  stopObserving: Element.Methods.stopObserving.methodize(),
-  loaded:        false
-});
+  Object.extend(Event, Event.Methods);
+
+  Object.extend(Event, {
+    fire:          fire,
+    observe:       observe,
+    stopObserving: stopObserving,
+    on:            on
+  });
+
+  Element.addMethods({
+    fire:          fire,
+
+    observe:       observe,
+
+    stopObserving: stopObserving,
+
+    on:            on
+  });
+
+  Object.extend(document, {
+    fire:          fire.methodize(),
+
+    observe:       observe.methodize(),
+
+    stopObserving: stopObserving.methodize(),
+
+    on:            on.methodize(),
+
+    loaded:        false
+  });
+
+  if (window.Event) Object.extend(window.Event, Event);
+  else window.Event = Event;
+})();
 
 (function() {
   /* Support for the DOMContentLoaded event is based on work by Dan Webb,
-     Matthias Miller, Dean Edwards and John Resig. */
+     Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */
 
   var timer;
 
   function fireContentLoadedEvent() {
     if (document.loaded) return;
-    if (timer) window.clearInterval(timer);
-    document.fire("dom:loaded");
+    if (timer) window.clearTimeout(timer);
     document.loaded = true;
+    document.fire('dom:loaded');
   }
 
-  if (document.addEventListener) {
-    if (Prototype.Browser.WebKit) {
-      timer = window.setInterval(function() {
-        if (/loaded|complete/.test(document.readyState))
-          fireContentLoadedEvent();
-      }, 0);
-
-      Event.observe(window, "load", fireContentLoadedEvent);
+  function checkReadyState() {
+    if (document.readyState === 'complete') {
+      document.stopObserving('readystatechange', checkReadyState);
+      fireContentLoadedEvent();
+    }
+  }
 
-    } else {
-      document.addEventListener("DOMContentLoaded",
-        fireContentLoadedEvent, false);
+  function pollDoScroll() {
+    try { document.documentElement.doScroll('left'); }
+    catch(e) {
+      timer = pollDoScroll.defer();
+      return;
     }
+    fireContentLoadedEvent();
+  }
 
+  if (document.addEventListener) {
+    document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
   } else {
-    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
-    $("__onDOMContentLoaded").onreadystatechange = function() {
-      if (this.readyState == "complete") {
-        this.onreadystatechange = null;
-        fireContentLoadedEvent();
-      }
-    };
+    document.observe('readystatechange', checkReadyState);
+    if (window == top)
+      timer = pollDoScroll.defer();
   }
+
+  Event.observe(window, 'load', fireContentLoadedEvent);
 })();
+
+Element.addMethods();
+
 /*------------------------------- DEPRECATED -------------------------------*/
 
 Hash.toQueryString = Object.toQueryString;
@@ -4158,16 +5877,9 @@ var Insertion = {
 
 var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
 
-// This should be moved to script.aculo.us; notice the deprecated methods
-// further below, that map to the newer Element methods.
 var Position = {
-  // set to true if needed, warning: firefox performance problems
-  // NOT neeeded for page scrolling, only if draggable contained in
-  // scrollable elements
   includeScrollOffsets: false,
 
-  // must be called before calling withinIncludingScrolloffset, every time the
-  // page is scrolled
   prepare: function() {
     this.deltaX =  window.pageXOffset
                 || document.documentElement.scrollLeft
@@ -4179,7 +5891,6 @@ var Position = {
                 || 0;
   },
 
-  // caches x/y coordinate pair to use with overlap
   within: function(element, x, y) {
     if (this.includeScrollOffsets)
       return this.withinIncludingScrolloffsets(element, x, y);
@@ -4206,7 +5917,6 @@ var Position = {
             this.xcomp <  this.offset[0] + element.offsetWidth);
   },
 
-  // within must be called directly before
   overlap: function(mode, element) {
     if (!mode) return 0;
     if (mode == 'vertical')
@@ -4217,7 +5927,6 @@ var Position = {
         element.offsetWidth;
   },
 
-  // Deprecation layer -- use newer Element methods now (1.5.2).
 
   cumulativeOffset: Element.Methods.cumulativeOffset,
 
@@ -4317,4 +6026,57 @@ Object.extend(Element.ClassNames.prototype, Enumerable);
 
 /*--------------------------------------------------------------------------*/
 
-Element.addMethods();
\ No newline at end of file
+(function() {
+  window.Selector = Class.create({
+    initialize: function(expression) {
+      this.expression = expression.strip();
+    },
+
+    findElements: function(rootElement) {
+      return Prototype.Selector.select(this.expression, rootElement);
+    },
+
+    match: function(element) {
+      return Prototype.Selector.match(element, this.expression);
+    },
+
+    toString: function() {
+      return this.expression;
+    },
+
+    inspect: function() {
+      return "#<Selector: " + this.expression + ">";
+    }
+  });
+
+  Object.extend(Selector, {
+    matchElements: function(elements, expression) {
+      var match = Prototype.Selector.match,
+          results = [];
+
+      for (var i = 0, length = elements.length; i < length; i++) {
+        var element = elements[i];
+        if (match(element, expression)) {
+          results.push(Element.extend(element));
+        }
+      }
+      return results;
+    },
+
+    findElement: function(elements, expression, index) {
+      index = index || 0;
+      var matchIndex = 0, element;
+      for (var i = 0, length = elements.length; i < length; i++) {
+        element = elements[i];
+        if (Prototype.Selector.match(element, expression) && index === matchIndex++) {
+          return Element.extend(element);
+        }
+      }
+    },
+
+    findChildElements: function(element, expressions) {
+      var selector = expressions.toArray().join(', ');
+      return Prototype.Selector.select(selector, element || document);
+    }
+  });
+})();