#xx a{display:block;width:100%;height:100%;}
#xx a span{display:none;width:100%;height:100%;}
2.背景图片定位
#xx ul li{ cursor:hand;float:left;width:130px;height:38px;margin:0px;background-image: url(../../images/);background-repeat:no-repeat;}
#xx ul li#abc{width:130px;height:38px;line-height:38px;background-position:0px 0px;}