$('.before-after li').addClass("rollover").filter(".before").css('width', 130); $('.before-after').addClass("active").mousemove(function(e) { var $el = $(this); w = e.pageX - $el.offset().left; $('.before').css('width', w); }); $('.before-after li img').mousedown(function(event) { event.preventDefault(); });
.before-after{ border:1px solid #333; display:block; list-style:none; margin:30px auto; overflow:hidden; position:relative; width:500px; } .before-after.active{ height:320px; } .rollover { display:block; overflow:hidden; position:absolute; } .active .before { border-right:3px solid #000; } .before { left:0px; top:0px; z-index:2; } .after { right:0px; top:0px; z-index:1; }
<ol class="before-after"> <li class="before"> <img src="http://farm4.staticflickr.com/3309/4584446317_ae43ab2563.jpg" /> </li> <li class="after"> <img src="http://farm5.staticflickr.com/4080/4810022338_fdf4bb4d85.jpg" /> </li> </ol> img by <a href="http://www.flickr.com/photos/arcticpuppy/">tibchris</a> CC-BY