*{padding:0; margin:0}
#totop{position:fixed;bottom:250px;right:10px;z-index:999;width:52px; cursor:pointer;display:none; }
*html #totop{position:absolute;cursor:pointer;right:10px;top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight)-350+"px")}
#totop a{display:block;width:71px;height:24px;padding-top:48px;text-align:center;color:#888}
#totop a.cur{background-position:-88px 0;text-decoration:none;color:#3a9}