Here are some lesser-know tricks for CSS dropshadows.
http://css-tricks.com/snippets/css/css-box-shadow/

You can create the following styles:

Using the following code:

<style type="text/css">
#example {
background: none repeat scroll 0 0 #ccc;
box-shadow: 5px 5px 5px #666;
height: 100px;
margin: 15px 0;
width: 100px;
}
#example2 {
background: none repeat scroll 0 0 #ccc;
box-shadow: 0 0 10px #000000 inset;
height: 100px;
margin: 15px 0;
width: 100px;
}
#example3 {
background: none repeat scroll 0 0 #ccc;
box-shadow: 0 8px 6px -6px black;
height: 100px;
margin: 15px 0;
width: 100px;
}
</style>