#mask {
	display: none;
	width: 100%;
	height: 100%;
	background-color: #000000;
	position: absolute;
	z-index: 5;
	left: 0;
	top: 0;
	opacity: 0.3;
	-ms-filter: "progid: DXImageTransform.Microsoft.Alpha(Opacity=30)";
	filter: alpha(opacity=30);
}