< type="text/css"> /*弹出层的STYLE*/ html,body {height:100%; margin:0px;} .pop{ z-index:99; width: 893px; height: 800px; left:50%;/*FF IE7*/ top: 50%;/*FF IE7*/ margin-left: -446.5px!important;/*FF IE7 该值为本身宽的一半 */ margin-top:-300px!important;/*FF IE7 该值为本身高的一半*/ margin-top:0px; position:fixed!important;/*FF IE7*/ position:absolute;/*IE6*/ _top: expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/ document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/ } .lightbox {display:none; background-color: rgb(000); width: 100%; height: 100%; left:0; top:0;/*FF IE7*/ filter:alpha(opacity=50);/*IE*/ opacity:0.5;/*FF*/ z-index:1; position:fixed!important;/*FF IE7*/ position:absolute;/*IE6*/ _top: expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/ document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/ } /*The END*/