#box1, #box2, #box3, #box4{
	position:absolute;
}

/* Sample 5*/
#box1 div{
	position:absolute;
	background:#1a1a1a;
	width:900px;
	height:300px;
}

#box5 img{
	position:static;
	float:left;
	width:900px;
	height:300px;
	margin:0 10px 10px 0;
}
.mask{
	position:relative;
	width:900px;
	height:300px;
	overflow:hidden;
}
.mask img{
	position:absolute;
	display:block;
	border:none;
}