摘要：
CSS： #scrolltop {display:none; position:fixed; bottom:80px; left:51%; _position:absolute; _top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight));margin-left:480px; font-size:14px; text-align:center; color:#f00; cursor:pointer; height:48px;w. 阅读全文
