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diff --git a/source/effects.fold.js b/source/effects.fold.js
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+/*
+ * jQuery UI Effects Fold
+ *
+ * Copyright (c) 2008 Aaron Eisenberger (aaronchi@gmail.com)
+ * Dual licensed under the MIT (MIT-LICENSE.txt)
+ * and GPL (GPL-LICENSE.txt) licenses.
+ * 
+ * http://docs.jquery.com/UI/Effects/Fold
+ *
+ * Depends:
+ *	effects.core.js
+ *
+ */
+(function($) {
+
+$.effects.fold = function(o) {
+
+	return this.queue(function() {
+
+		// Create element
+		var el = $(this), props = ['position','top','left'];
+		
+		// Set options
+		var mode = $.effects.setMode(el, o.options.mode || 'hide'); // Set Mode
+		var size = o.options.size || 15; // Default fold size
+		
+		// Adjust
+		$.effects.save(el, props); el.show(); // Save & Show
+		var wrapper = $.effects.createWrapper(el).css({overflow:'hidden'}); // Create Wrapper
+		var ref = (mode == 'show') ? ['width', 'height'] : ['height', 'width'];
+		var distance = (mode == 'show') ? [wrapper.width(), wrapper.height()] : [wrapper.height(), wrapper.width()];
+		if(mode == 'show') wrapper.css({height: size, width: 0}); // Shift
+		
+		// Animation
+		var animation1 = {}, animation2 = {};
+		animation1[ref[0]] = mode == 'show' ? distance[0] : size;
+		animation2[ref[1]] = mode == 'show' ? distance[1] : 0;
+		
+		// Animate
+		wrapper.animate(animation1, o.duration / 2, o.options.easing)
+		.animate(animation2, o.duration / 2, o.options.easing, function() {
+			if(mode == 'hide') el.hide(); // Hide
+			$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
+			if(o.callback) o.callback.apply(el[0], arguments); // Callback
+			el.dequeue();
+		});
+		
+	});
+	
+};
+
+})(jQuery);