#content_background{
background: transparent;
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#BF000000,endColorstr=#BF000000)"; 
/* IE8 */    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#BF000000,endColorstr=#BF000000); 
  /* IE6 & 7 */     
   zoom: 1;
   }