#box1{
	position:absolute;
}
.mask{
	position:relative;
	width:250px;
	height:175px;
	overflow:hidden;
	border-right: 1px solid #000;
	border-bottom: 1px solid #000;
	float: right;
}
.mask2{
	position:relative;
	width:250px;
	height:245px;
	overflow:hidden;
	border-right: 1px solid #000;
	border-bottom: 1px solid #000;
	float: right;
}
.mask3{
	position:relative;
	width:250px;
	height:300px;
	overflow:hidden;
	border-right: 1px solid #000;
	border-bottom: 1px solid #000;
	float: right;
}
.mask4{
	position:relative;
	width:250px;
	height:160px;
	overflow:hidden;
	border-right: 1px solid #000;
	border-bottom: 1px solid #000;
	float: right;
}
.mask img, .mask2 img, .mask3 img, .mask4 img{
	position:absolute;
	display:block;
	border:none;
}