.whead{position:relative;left:0px;top:0px;width:100%;z-index:999}
.whead .tab{height:40px; line-height:40px;background:#eee;color:#333; text-align:center;}
.whead .tab i{font-style:normal;margin:10px 5px;}
.whead .tab i a{width:20px;height:20px;display:block}
.whead .tab i.l{position:absolute;left:10px;width:20px;height:20px;background:url(../image/back.png) no-repeat; background-size:20px 20px;}
.whead .tab i.r{position:absolute;right:10px;width:20px;height:20px;background:url(../image/class.png) no-repeat; background-size:20px 20px;}
.whead .tab i.h{position:absolute;right:40px;width:20px;height:20px;background:url(../image/home.png) no-repeat; background-size:20px 20px;}