.return_top{position:fixed;right:5%;bottom:0;margin:0 0 0 -200px;_position:absolute;_bottom:-1px;overflow:hidden;*zoom:1}.return_top .tips_to_top{width:49px;height:38px;display:block;background:url(http://imgcache.qq.com/bossweb/fan/images/index.png) -446px -80px no-repeat;text-indent:-999em;overflow:hidden}* html .return_top{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)))}/*  |xGv00|11dd93eb66bb9c49c9b24fac3ef6799e */