#global_search_btn{background:url(images/sousuo.png) no-repeat;width: 13px;
    height: 13px;
    margin-top: 8px;}
.block-top .bd ul li{background:url(images/lianjie.png) no-repeat;}
.block-top .bd ul li:hover{background:url(images/lianjie1.png) no-repeat;}