#gotop{ 
	display:none; 
	width:54px;
	height:54px;
	position:fixed;  
	z-index:1000;
	bottom:50px;  
	right:100px; 
 	border-radius:10px 10px 10px 10px; 
	text-decoration:none; 
	cursor: pointer;
	background: url(img/go_top.png) no-repeat;
	font-size: 0px;
	zoom: 1;
}