*{ margin:0px; padding:0px;}
.botton{ color:#f00; cursor:pointer;}
#cwxbg{ position:absolute; display:none; background:#000; width:100%; height:100%; left:0px; top:0px; z-index:1000;}
#cwxwd{ position:absolute; display:none; border:10px solid #ccc; padding:10px;background:#fff; z-index:1500;}
#cwxcn{ background:#fff; display:block;}


.retxeremplore {
    width: 500px;
    height: 350px;
    padding: 0;
    border: 0;
}
 .mydiv {   background-color: #fff;
            border: 1px solid #f90;
            text-align: center;
            line-height: 40px;
            font-size: 12px;
            font-weight: bold;
            z-index: 99;
            width: 500px;
            height: 365px;
            left: 45%; /*ff ie7*/
            top: 40%; /*ff ie7*/
            margin-left: -150px!important; /*ff ie7 该值为本身宽的一半 */
            margin-top: -60px!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*/
        }