CSS transparent background

/* default fallback */
background: rgb(255, 255, 255) transparent;
/* nice browsers */
background: rgba(255, 255, 255, 0.8);
/* IE 6/7 */
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#CCFFFFFF, endColorstr=#CCFFFFFF);
/* IE8 */    
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#CCFFFFFF, endColorstr=#CCFFFFFF)";