#layer{position: fixed;top:0;left:0;z-index: 9998;display: none;width: 100%;height: 100%;background: url(http://www.thea.cn/21cnimages/bg1.png) repeat center;}
#midtc{width: 480px;height: 297px;position: fixed;z-index: 9999;left: 50%;margin-left: -240px;top: 50%;margin-top: -148.5px;background: url(http://www.thea.cn/21cnimages/mrtanc.png);display: none;}
#midtc .a_con{width: 228px;height: 35px;position: absolute;left: 126px;top: 242px;}
#midtc .a_con a{width: 210px;float: left;display: block;height: 50px;cursor: pointer;}
#midtc .a_con a.a1{margin-right: 37px;}
#midtc .a_con a.a2{margin-right: 25px;}
#midtc .online_zx{width: 142px;height: 30px;position: absolute;left: 136px;top: 390px;display: block;}
#midtc .close{width: 30px;height: 30px;margin-right: 11px;position: absolute;right: 0;top: 0;display: block;cursor: pointer;}