div#overlay
{
	position: absolute; 
	top: 0px; 
	left: 0px; 
	z-index: 2; 
	width: 100%; 
	height: 100%; 
	/* first */
	-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
	/* second */
	filter: alpha(opacity=75); 
	opacity: 0.75; 
	background: #a0a0a0;
	display: none;
}