.black_overlay{display: none; position: absolute; top: 0%; left: 0%; width: 100%; height: 100%; z-index:1001; -moz-opacity: 0.8; opacity:.80; filter: alpha(opacity=80);}
.white_content {display: none; position: absolute; top: 15%; left: 10%; width:80%; height:80%; z-index:1002; overflow: auto;}
.guanbi{ width:17px; height:16px; float:right; z-index:10000; margin-top:2px;cursor:pointer; background:url(imgs/guanbi.jpg) no-repeat center; display:block;}
.white_content_small {display: none;position: absolute; top: 20%;left: 30%;width: 40%; height: 50%; border: 16px solid lightblue;background-color: white;z-index:1002; overflow: auto;}
.tanchu{  width:250px; height:120px; margin:0 auto; background-color:#fff;}