.menu{overflow:auto;display:block;padding:0px;margin:0px auto 0 auto;}
.menu ul{list-style:none;padding:0;margin:0;}
.menu ul li{float:left;overflow:hidden;position:relative;line-height:48px;text-align:center;}
.menu ul li a{position:relative;display:block;width:111px;height:48px;font-family:"微软雅黑", "宋体";font-size:18px;font-weight: bold;text-decoration:none;cursor:pointer;font-weight:bold;line-height:48px;}
.menu ul li a span{position:absolute;left:0;width:111px;}
.menu ul li a span.out{top:0px;}
.menu ul li a span.over,  .menu ul li a span.bg{top:-48px;}
#menu2{background-image:url(../images/s_03.jpg);background-repeat:repeat;}
#menu2 ul li a span.over{height:48px;width:111px;background-image:url(../images/w_03.jpg);background-repeat:repeat;}