#midtc{width: 640px;height: 338px;position: fixed;z-index: 9999;left: 50%;margin-left: -320px;top: 50%;margin-top: -169px;background: url(http://www.thea.cn/zt/images/mbatc.png);display: none;}
#midtc .a_con{width: 640px;height: 55px;position: absolute;left: 1px;top: 285px;}
#midtc .a_con a{width: 320px;float: left;display: block;height: 55px;cursor: pointer;}
#midtc .a_con a.a1{float: left;}
#midtc .a_con a.a2{float: right;}
#midtc .close{width: 40px;height: 40px;margin-right: 11px;position: absolute;right: 0;top: 0;display: block;cursor: pointer;}