@charset "UTF-8";
        .top_nav{
			font-size: 100%;
            margin: 1px 0 0 0;
            list-style: none ;
            border-bottom: 0px solid #063; /*菜单底部加下划线,0为取消 */
            overflow: hidden ;       
        }
        .top_nav li{
            float: left ;
            margin-right: 1px;
			margin-left:30px;
        }
        .top_nav li a{
            position: relative ;
            line-height: 30px;
            text-decoration: none ;
            background: #063 ;
            color: #fff ;
            display: block ;
            width: 148px;
            text-align: center ;
        }
        .top_nav li a:hover span {
	        position: relative ;
            line-height: 30px;
            text-decoration: none ;
            background: #9C3 ;
            color: #fff;
            display: block ;
            width: 148px ;
            text-align: center ;
        }