#midtc{width: 550px;height: 340px;position: fixed;z-index: 9999;left: 50%;margin-left: -305px;top: 50%;margin-top: -221px;background: url(http://www.thea.cn/zt/images/tc-sz-xl.jpg);display: none;}
	#midtc .a_con{width: 475px;height: 50px;position: absolute;left: 42px;top: 280px;}
	#midtc .a_con a{width: 475px;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: 5px;position: absolute;right: 0;top: 0;display: block;cursor: pointer;}