.photos div {
	float: left;
	display: block;
	position: relative;
	margin: 6px; 
	border: 2px solid #EEEEEE;
	height: 300px;
	width: 300px;
}
.photos div img.nocolor {
	position: absolute;
	left: 0;
	top: 0;
	z-index: 1;  
}
.photos div img.color {
	position: absolute;
	left: 0; 
	top: 0;
}