#fade {
	background: #000;
	position: absolute;
	width: 100%;
	height: 100%;
	filter:alpha(opacity=80);
	opacity: .80;
	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=80)"; /*--IE 8 Transparency--*/
	left: 0;
	top: top:expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop : document.body.scrollTop);
	z-index: 10;
}

#hideshow {
	position: absolute;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
}

.popup_block {
	background: #ddd;
	padding: 10px 20px;
	border: 10px solid #fff;
	float: left;
	width: 480px;
	position: fixed;
	top: 20%;
	left: 50%;
	margin: 0 0 0 -250px;
	z-index: 100;
}