.shadow {-moz-box-shadow: 3px 3px 4px #000;}
-webkit-box-shadow: 3px 3px 4px #000;
box-shadow: 3px 3px 4px #000;
/* For IE 8 */
-ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000')";
/* For IE 5.5 - 7 */
filter: progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000');
http://robertnyman.com/2010/03/16/drop-shadow-with-css-for-all-web-browsers/
CSS Cross browser shadow for divs
