鼠标悬停 图片自动放大功能 jquery

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script><style>ul,li{ list-style:none; float:left; }</style><script>$(function(){        $("#gallery li").mouseover(function(){var y = $(this).offset().top+50;var x = $(this).offset().left+50;var imgsrc = $(this).children().attr("src");var html = "<div id='pop' style='position:absolute; top:"+y+"px;left:"+x+"px;'> <img src='"+imgsrc+"' width='400' height='300'/></div>";$("body").append(html);});$("#gallery li").mouseout(function(){$("#pop").remove();});    })</script><ul id="gallery">  <li><img src="http://m2.quanjing.com/2m/sps009/4251r-4561.jpg" width="60" height="60"></li></ul>