<html>
<head>
<style>
.mydiv1 {height:250px;width:250px;border:#909090 1px solid;}
.mydiv2 {
width:250px;height:250;border:#909090 1px solid;background:#fff;color:#333;
filter:progid:DXImageTransform.Microsoft.Shadow(color=#909090,direction=120,strength=4);/*ie*/
-moz-box-shadow: 2px 2px 10px #909090;/*firefox*/
-webkit-box-shadow: 2px 2px 10px #909090;/*safari或chrome*/
box-shadow:2px 2px 0px #909090;/*opera或ie9*/
}
</style>
<script>
function changediv(v){
var d = document.getElementById("mydiv");
if(v == "t") d.className="mydiv2";
else d.className="mydiv1";
}
</script>
</head>
<body>
<div id="mydiv" class="mydiv1" onmouseover="changediv('t');" onmouseout="changediv('f');">
contents
</div>
</body>
</html>