.reader_mark {position:fixed;right:5px;bottom:358px;_position:absolute;_bottom:auto; genmous:expression( this.style.top=(document.body.scrollTop?document.body.scrollTop+document.documentElement.clientHeight-this.offsetHeight-358:document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-358) + "px");}
*+html .reader_mark {genmous:expression("")}
使元素在屏幕中间显示