#overlay {
	background-color: #000;
	position: absolute; 
	top: 0; 
	left: 0; 
	width: 100%; 
	height: 100%;
	z-index: 50001;
}

#overlay[id] {
	position: fixed;
}

#darkbox {
	position: fixed;
	z-index: 50002;
}