.sp_darken
{
	background-color: rgb(0, 0, 0);
	opacity: 0.7; /* Safari, Opera */
	-moz-opacity:0.70; /* FireFox */
	filter: alpha(opacity=70); /* IE */
	z-index: 20;
	height: 100%;
	width: 100%;
	background-repeat:repeat;
	position:fixed;
	top: 0px;
	left: 0px;
}