#box_view{
	position:absolute;
}

.mask_tym{
	position: relative; 
	top:20px;
	width:300px;
	height:200px;
	overflow:;
}
.mask{
	position:relative;
	width:300px;
	height:70px;
	overflow:hidden;
}
.mask img{
	position: absolute;
	display:block;
	border:none;
	left: 0px;
	top: 0px;
}
span img{
	display:block;
	border:none;
}