#box1{
	position:absolute;
}

#box1 span{
	display:block;
	float:left;
	margin-right:1px;
}
.mask1{
	position:relative;
	width:301px;
	height:226px;
	overflow:hidden;
	text-align:center;
	margin: 0 auto;
}

span img{
	display:block;
	border:none;
}