谁来帮我看下这个JS代码
<link href="css/erjiye.css" rel="stylesheet" type="text/css" />
<script type="text/javascript"> function getObject(objectId) {
if (document.getElementById && document.getElementById
(objectId)) { return document.getElementById(objectId); } else if (document.all && document.all(objectId)) {
return
document.all(objectId);
} else if (document.layers && document.layers[objectId]) { return document.layers[objectId]; } else {
return false;
}
} function showHide(e, objname) {
var obj = getObject(objname); if (obj.style.display == "none") {
obj.style.display = "block"; e.className = "minus";
} else { obj.style.display = "none"; e.className = "plus"; }
} </script>
<div class="memberl">
<div class="lborder">
<div class="nav_menu">
<div class="yjcd">配饰</div>
<dl>
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items120');"><span></span><a href="#">服饰配件</a></a></dt>
<dd id="items120" style="display:none;">
<ul>
<li><a href="#">围巾丝巾</a></li>
<li><a href="#">围巾、丝巾、披肩</a></li>
</ul>
</dd>
</dl>
<dl>
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items119');"><span></span><a href="#">潮流饰品</a></a></dt>
<dd id="items119" style="display:none;">
<ul>
<li><a href="#">耳饰</a></li>
<li><a href="#">假发</a></li>
</ul>
</dd>
</dl>
<div class="yjcd">服装</div>
<dl>
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items118');"><span></span><a href="#">时尚男装</a></a></dt>
<dd id="items118" style="display:none;">
<ul>
<li><a href="#">男时尚衬衫</a></li>
</ul>
</dd>
</dl>
<dl>
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items117');"><span></span><a href="#">潮流女装</a></a></dt>
<dd id="items117" style="display:none;">
<ul>
<li><a href="#">职业裤装</a></li>
</ul>
</dd>
</dl>
</div>
</div></div>
/*左侧菜单样式*/
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
a{color:#5e5e5e;font-size:14px;text-decoration:none;}
a:hover{color:#3366cc;text-decoration:underline;}
.nav_menu{width:180px;margin:0px auto;}
.nav_menu dl{background:url(../images/verline.gif) no-repeat 0px 0; margin-left:12px;}
.nav_menu dl dt a{height:26px;line-height:26px;overflow:hidden;color:#5e5e5e;font-weight:800;}
.nav_menu dl dt a span{display:inline-block;width:13px;height:20px;overflow:hidden;float:left;margin:0 5px 0 0;}
.nav_menu dl dt a.minus span{background:url(../images/showbtn.gif) no-repeat left center;}
.nav_menu dl dt a.plus span{background:url(../images/hidebtn.gif) no-repeat left center;}
.nav_menu dl dd li{height:26px;line-height:26px;padding:0 0 0 18px}
.yjcd{ width:100%; margin:0 auto; background:url(../images/hidebtn1.gif) no-repeat left center; color:#333;padding-left:20px; font-weight:bold; font-size:14px;}
.zxr{ width:100%; margin:0 auto; font-size:12px; line-height:30px; border-top:1px dashed #CCC; text-align:right; margin-top:12px;}
.cp{ position:relative;width:985px; margin:0 auto; border:1px solid #eeeeee; margin-top:10px; padding:5px;}
.cp span{ position:absolute; width:100px; right:10px; vertical-align:middle; text-align:right;}
.zhifb{ background:#fffbe1; border-bottom:1px dashed #febf90; width:100%; min-height:64px; padding:20px 10px 0px; vertical-align:middle;}
.wangyin{ width:100%; margin:0 auto;}
.wangyin ul{ list-style:none;margin:0 auto;}
.wangyin ul li{width:230px; float:left; margin-left:15px; margin-bottom:15px;}
.bordercs{ border-bottom:1px dashed #fdbf90; width:100%;}
<style>
/*左侧菜单样式*/
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
a{color:#5e5e5e;font-size:14px;text-decoration:none;}
a:hover{color:#3366cc;text-decoration:underline;}
.nav_menu{width:180px;margin:0px auto;}
.nav_menu dl{background:url(verline.gif) no-repeat 0px 0; margin-left:12px;}
.nav_menu dl dt a{height:26px;line-height:26px;overflow:hidden;color:#5e5e5e;font-weight:800;}
.nav_menu dl dt a span{display:inline-block;width:13px;height:20px;overflow:hidden;float:left;margin:0 5px 0 0;}
.nav_menu dl dt a.minus span{background:url(showbtn.gif) no-repeat left center;}
.nav_menu dl dt a.plus span{background:url(hidebtn.gif) no-repeat left center;}
.nav_menu dl dd li{height:26px;line-height:26px;padding:0 0 0 18px}
.yjcd{ width:100%; margin:0 auto; background:url(hidebtn1.gif) no-repeat left center; color:#333;padding-left:20px; font-weight:bold; font-size:14px;}
.zxr{ width:100%; margin:0 auto; font-size:12px; line-height:30px; border-top:1px dashed #CCC; text-align:right; margin-top:12px;}
.cp{ position:relative;width:985px; margin:0 auto; border:1px solid #eeeeee; margin-top:10px; padding:5px;}
.cp span{ position:absolute; width:100px; right:10px; vertical-align:middle; text-align:right;}
.zhifb{ background:#fffbe1; border-bottom:1px dashed #febf90; width:100%; min-height:64px; padding:20px 10px 0px; vertical-align:middle;}
.wangyin{ width:100%; margin:0 auto;}
.wangyin ul{ list-style:none;margin:0 auto;}
.wangyin ul li{width:230px; float:left; margin-left:15px; margin-bottom:15px;}
.bordercs{ border-bottom:1px dashed #fdbf90; width:100%;}
</style>
<script type="text/javascript">
function getObject(objectId) {
if (document.getElementById && document.getElementById(objectId)) { return document.getElementById(objectId); }
else if (document.all && document.all(objectId)) {
return document.all(objectId);
} else if (document.layers && document.layers[objectId]) { return document.layers[objectId]; } else {
return false;
}
}
function showHide(e, objname) {
var obj = getObject(objname); if (obj.style.display == "none") {
obj.style.display = "block"; e.className = "minus";
} else { obj.style.display = "none"; e.className = "plus"; }
}
function rootClick(dv) {
var img = dv.getElementsByTagName('img')[0], exp = img.src.indexOf('hidebtn.gif') != -1;
img.src = exp ? 'showbtn.gif' : 'hidebtn.gif';
while (dv = dv.nextSibling) {
if (dv.nodeType == 3) continue;//非IE下的空白节点忽略
if (dv.className == 'yjcd') break;
dv.style.display = exp ? 'block' : 'none';
}
}
</script>
<div class="memberl">
<div class="lborder">
<div class="nav_menu">
<div class="yjcd" onclick="rootClick(this)"><img src="hidebtn.gif" />配饰</div>
<dl style="display:none">
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items120');"><span></span><a href="#">服饰配件</a></a></dt>
<dd id="items120" style="display:none;">
<ul>
<li><a href="#">围巾丝巾</a></li>
<li><a href="#">围巾、丝巾、披肩</a></li>
</ul>
</dd>
</dl>
<dl style="display:none">
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items119');"><span></span><a href="#">潮流饰品</a></a></dt>
<dd id="items119" style="display:none;">
<ul>
<li><a href="#">耳饰</a></li>
<li><a href="#">假发</a></li>
</ul>
</dd>
</dl>
<div class="yjcd" onclick="rootClick(this)"><img src="hidebtn.gif" />服装</div>
<dl style="display:none">
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items118');"><span></span><a href="#">时尚男装</a></a></dt>
<dd id="items118" style="display:none;">
<ul>
<li><a href="#">男时尚衬衫</a></li>
</ul>
</dd>
</dl>
<dl style="display:none">
<dt><a href="javascript:void(0);" class="plus" onClick="showHide(this,'items117');"><span></span><a href="#">潮流女装</a></a></dt>
<dd id="items117" style="display:none;">
<ul>
<li><a href="#">职业裤装</a></li>
</ul>
</dd>
</dl>
</div>
</div></div>
