var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';
var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';
var distance = o.options.distance || (ref == 'top' ? el.outerHeight({margin:true}) : el.outerWidth({margin:true}));
- if (mode == 'show') el.css(ref, motion == 'pos' ? -distance : distance); // Shift
+ if (mode == 'show') el.css(ref, motion == 'pos' ? (isNaN(distance) ? "-" + distance : -distance) : distance); // Shift
// Animation
var animation = {};