.wdoverlay
{
	position: relative;
	display:block;
	width: 100%;
	height: 100%;
}
.doverlay
{
	position: absolute;
	top:0;
	left:0;
	width: 100%;
	height: 100%;
	background: rgba(0,0,0,0.2);
	opacity: 1;
	transition: opacity 300ms; -moz-transition: opacity 300ms; -webkit-transition: opacity 300ms; -o-transition: opacity 300ms;	
}

.wdoverlay:hover .doverlay
{
	opacity: 0;
}