ie6 css 返回顶部图标固定在浏览器右下角
#e_float{ _position:absolute;_bottom:auto;_right:50%;_margin-right:-536px;_top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop,10)||0)-(parseInt(this.currentStyle.marginBottom,10)||0)));}