.nav{width:100%;height: 23px;}

#menu, #menu ul {
    margin: 0;
    padding: 0;
    list-style: none;}
#menu {
    width: 500px;
    margin: 0 auto;
    zoom: 1;}

#menu li {
    text-align: center;
    line-height: 23px;
    float: left;
    margin:0;
    padding: 0 5px 0 10px;
    border-right:none;
    position: relative;
    background:url(dfiles/12766/page/main765/images/button1.gif) no-repeat left center;}
#menu a {
    color: #fff;
    font-family: "宋体";
    
    font-size: 13px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;}
#menu li:hover {
    background-color:none;}
#menu ul {/* padding:0 20px; */display: block;_margin: 0;opacity: 0;visibility: hidden;position: absolute;top: 23px;left: 0;z-index: 1;background: #277b2a;}
#menu li:hover > ul {
    opacity: 1;
    visibility: visible;
    margin: 0;}
#menu ul ul {
    top: 0;
    left: 0;
    margin: 0  auto;
    _margin: 0;}
#menu ul li {
    /* width: 100%; */
    height: 20px;
    display: block;
    float: none;
    z-index: 1;
    padding: 0;
    display: block;
    padding:0px;
    border: 0;
    _line-height: 20px;
    background:none; margin:0;}

#menu ul a {
    padding: 0px 10px;
    color: #fff;
    font-size: 12px;font-family: "宋体";font-weight: none;
    _height: 20px;
    display: block;
    white-space: nowrap;
    float: none;background-color: #277b2a;
    text-transform: none;}
#menu ul a:hover { color: #000;
    background-color:#277b2a;}