chinaz中国站长网的导航条效果遇到的问题，麻烦高手帮忙解决一下

nav.css
.container {
    width: 810px;
    min-height: 100%;
    margin: auto;
    text-align: left;
    background: #fff;
}
.nav a:link, a:visited {
    color: #333;
    text-decoration: none;
}


/* Nav
==========================================================*/
.nav {
        font: 12px/1.5 Tahoma, Helvetica, Arial, sans-serif;
    position: relative;
    margin: 0 10px 10px;
    background: url(../images/../images/nav_bg.png) no-repeat 0 -36px;
}
.navinner {
    background: url(../images/nav_bg.png) no-repeat 100% -72px;
}
.navlist {
    height: 36px;
    line-height: 36px;
    overflow: hidden;
    margin: 0 10px;
    background: url(../images/nav_bg.png) repeat-x 0 0;
}
.nav li {
    float: left;
    display: inline;
    margin: 0 0 0 -2px;
    padding: 0 4px 0 6px;
    background: url(../images/nav_bg.png) no-repeat 0 -108px;
}
.nav a {
    display: block;
    width: 76px;
    text-align: center;
    font-size: 120%;
}
.nav a:link, .nav a:visited {
    color: #fff;
}
.nav a.current, .nav a:hover, .nav a:active {
    color: #fff;
    font-weight: bold;
    background: url(../images/nav_bg.png) no-repeat 50% -144px;
}
.subnav {
    position: absolute;
    top: 41px;
    left: 0;
    float: left;
    height: 27px;
    line-height: 27px;
    white-space: nowrap;
    background: url(../images/nav_bg.png) no-repeat 0 -180px;
}
* html .subnav {
    margin: 0 10px 0 -10px; /* IE 6 and below */
}
.subnav p {
    padding: 0 10px;
    background: url(../images/nav_bg.png) no-repeat 100% -234px;
}
.subnav p span {
    display: block;
    background: url(../images/nav_bg.png) repeat-x 0 -207px;
}
.subnav p.pointer {
    position: absolute;
    top: -4px;
    left: 0;
    height: 5px;
    width: 11px;
    padding: 0;
    margin-left: 20px;
    text-indent: -999em;
    background: url(../images/nav_bg.png) repeat-x 0 -261px;
}
.subnav a {
    display: inline;
    padding: 0;
    font-size: 100%;
}
[class~="subnav"] a {
    padding: 0 3px;
}
.subnav, .subnav a:link, .subnav a:visited {
    color: #235e99;
}
.subnav a:hover, .subnav a:active {
    color: #235e99;
}
.subnav a:hover, .subnav a:active {
    font-weight: normal;
    background: none;
    border-bottom: 2px solid;
}
/* subnav position and pointer position */
#subnav5 { left:340px;}
#subnav5 .pointer { left: 20px;; right: 290px; }
#subnav5 { min-width: 340px; }


/* Note
==========================================================*/
.note {
    margin: 0 15px 10px;
        color:#666666;
}
.note span{
        float:right;
}
.disable {
    display: none;
}


nav.js


function $(id) {
    return document.getElementById(id);
}
function showMenu (baseID, divID) {
    baseID = $(baseID);
    divID  = $(divID);

    //var l = GetOffsetLeft(baseID);
    //var t = GetOffsetTop(baseID);

    //divID.style.left = l + 'px';
//    divID.style.top = t + baseID.offsetHeight + 'px';
    if (showMenu.timer) clearTimeout(showMenu.timer);
        hideCur();
    divID.style.display = 'block';
        showMenu.cur = divID;

    if (! divID.isCreate) {
        divID.isCreate = true;
        //divID.timer = 0;
        divID.onmouseover = function () {
            if (showMenu.timer) clearTimeout(showMenu.timer);
                        hideCur();
            divID.style.display = 'block';
        };

        function hide () {
            showMenu.timer = setTimeout(function () {divID.style.display = 'none';}, 1000);
        }

        divID.onmouseout = hide;
        baseID.onmouseout = hide;
    }
        function hideCur () {
                showMenu.cur && (showMenu.cur.style.display = 'none');
        }
}