div.top{height: 40px; width: 100%; background-color: #000; overflow: hidden;}
div.top_logo_left{float: left; width: auto; height: auto;}
div.top_nv_right{width: auto; height: auto; float: right;}
div.top_nv_right a{font:12px 宋体; color:#fff; text-decoration:none; line-height:40px; margin:0px 5px 0px 5px;}
div.top_nv_right a:hover{font:12px 宋体; color:#fff; text-decoration:underline; line-height:40px;}