#box_viewer{
	position:absolute;
}

.mask_viewer{
	position:relative;
	width:277px;
	height:170px;
	overflow:hidden;
}
.mask_viewer img{
	position:absolute;
	display:block;
	border:none;
}


.mask_viewer02{
	position:relative;
	width:193px;
	height:118px;
	overflow:hidden;
}
.mask_viewer02 img{
	position:absolute;
	display:block;
	border:none;
}