.obertka {
	width: 100%;
	height: 100%;
	left:0;
	top:0;
	position:absolute;
	z-index:10;
	background: #000; 
	opacity: 0.8;
	filter: progid:DXImageTransform.Microsoft.Alpha(opacity=80);
	display: block;
}
.ilayer{position:absolute;z-index:20;}