HTML {_background: url(https://mdw.bnu.edu.cn/images/trans.gif) no-repeat fixed;}
.bgstretcher-area { text-align: left; }
.bgstretcher, .bgstretcher UL, .bgstretcher UL LI {
	position: absolute;
	top: 0;
	left: 0;
}
.bgstretcher UL, .bgstretcher UL LI {
	margin: 0;
	padding: 0;
	list-style: none;
}
.bgstretcher {
	background: black;
	overflow: hidden;
	width: 100%;
	position: fixed;
	z-index: 1;
	_position: absolute; 
	top: 0;
	left: 0;
}