shadowOn

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="js/jquery.guid.js"></script>
<script type="text/javascript" src="js/jquery.dotimeout.js"></script>
<script type="text/javascript" src="js/jquery.shadowon.min.js"></script>

<script type="text/javascript">
   $(document).ready(function () {
      $("#div1").shadowOn();
      $("#div2").shadowOn( { imageset: '88' } );         
   });
</script>
...
<div id="div1" style="width:200px;height:200px;background-color:blue;"></div>
<div id="div2" style="width:200px;height:200px;background-color:green;"></div>

$(".shadowon").shadowOn({
    imagepath: "images", //Path to the shadowOn image folders
    imageset: "4", //Shadow to use, 1 to 88
    autoresize: true, //When the browser or the element is resized the shadow will automatically refresh itself  
    resizetimer: 250 //Timer to check it the resize have happened, set in milliseconds
});