#menu { width: 246px; border-bottom:none;float:left;background:#fff;}
/*1级*/
#menu ul { list-style: none; margin: 0px; padding: 0px; }
#menu ul li { background:url(../images/31.png) 0px 0px no-repeat; height:36px; font:14px/36px Microsoft YaHei,SimSun,Arial,Sans-Serif; text-align:center;position:relative;margin-top:0px;color:#000; }
#menu ul li:hover{ background:url(../images/32.png) 0px 0px no-repeat; height:36px; font:14px/36px Microsoft YaHei,SimSun,Arial,Sans-Serif; text-align:center;position:relative; }
.classoneli:hover>a{color:#fff;}

/*2级*/
#menu ul li ul { display:none; position: absolute; left: 225px;top: 0px; width:225px;margin-left:5px;background:url(../images/31.png) 0px 0px no-repeat;}
#menu ul li ul li{position:relative;}
#menu ul li:hover #classtwo { display:block;}
#menu ul li:hover { background:url(../images/32.png) 0px 0px no-repeat;}
#menu ul li ul li:hover a{color:#fff;}
/*3级*/
#menu ul li ul li ul{ display:none; position: absolute; left: 200px; top: 0px; width:200px;margin-left:0px;background:#eee}
#menu ul li ul li ul li{position:relative;}
#menu ul li ul li:hover ul{display:block;}