/* Sample 1*/
#box1{
	position:absolute;
	z-index: 0;
}
#box1 span{
	display:block;
	float:left;
}
.mask{
	position:relative;
	width:635px;
	height:300px;
	overflow:hidden;
}

span img{
	border-top-style: none;
	border-right-style: none;
	border-bottom-style: none;
	border-left-style: none;
	display: block;
}