Utilizing Box Shadow in modern browsers [IE>8] without the need for images, this code ensures compatibility with all browsers including IE versions prior to 9.
box-shadow:2px 2px 10px 10px #C9C9C9;
-webkit-box-shadow:2px 2px 10px 10px #C9C9C9;
-moz-box-shadow:2px 2px 10px 10px #C9C9C9;
/* For IE<9 */
filter:
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=0,strength=5),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=45,strength=2),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=90,strength=5),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=135,strength=5),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=180,strength=10),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=225,strength=5),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=270,strength=5),
progid:DXImageTransform.Microsoft.Shadow(color=#C9C9C9,direction=315,strength=2);
Box shadow support starts from IE 9 onwards.