#gotop{ 
	width:36px; 
	height:48px; 
	background:url(../images/gotop.png) no-repeat; 
	position:fixed; 
	right:50px; 
	cursor:pointer;
	bottom:67px;
	 _margin-bottom:67px;
	_position:absolute;
	_bottom:auto;
	_top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop,10)||0)-(parseInt(this.currentStyle.marginBottom,10)||0)));
}