a{font:14px microsoft yahei,Verdana, Arial;color:#666;text-decoration: none}
#menu { width: 248px;  border-bottom:none;float:left;background:#dbdbdb}
/*1级*/
#menu ul { list-style: none; margin: 0px; padding: 0px;  }
#menu ul li { background: #fff;  height:50px; line-height: 50px;text-align:center; font-size:16px;position:relative;margin-top:5px; }
#menu ul li:hover { background: #ffffff;  height:50px; line-height: 50px; position:relative; }


/*2级*/
#menu ul li ul { display:none; position: absolute; left: 244px;top: 0px; width:200px;margin-left:5px;background:#dbdbdb; }
#menu ul li ul li{position:relative;}
#menu ul li {
    background: #f4f4f4;
    height: 50px;
    line-height: 50px;
    text-align: center;
    font-size: 16px;
    position: relative;
    margin-top: 2px;
}
ul, li {
    list-style-type: none;
}
div, li, td, p, select, input, textarea, a, button, input {
    font: 12px 'microsoft yahei',Verdana, Arial;
    color: #666;
    text-decoration: none;
}
* {
    font-family: microsoft yahei,Verdana, Arial;
}
#menu ul li:hover #classtwo { display:block;}
#menu ul li:hover {background: #ffffff;}
/*3级*/
#menu ul li ul li ul{ display:none; position: absolute; left: 201px; 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;}