求助 鼠标移到小图上显示大图的代码

#enlarge {padding:0; margin:0; list-style-type:none; width:40px; height:40px;}
#enlarge li {display:block; float:left; width:40px; height:40px; position:relative;}
#enlarge li a {display:block; width:40px; height:40px; background:transparent; overflow:hidden; position:relative;}
#enlarge li a img {width:100%; height:100%; border:1;}
#enlarge li a:hover {position:absolute; left:-210px; top:-20px; width:250px; height:250px; z-index:100; border:1px;}
/*CSS*/

<ul id="enlarge"><li><a href='#'><img src="../UpLoadFile/Case/<%=Rst("ProPic")%>" width="40" height="40" style="border:1px solid #cccccc"></a></li></ul>
显示代码