DIV+CSS构成的树型菜单

这是用DIV+CSS+JS构成的树型菜单，采用列表,符合WEB标准，在大多数WIN浏览器下，兼容性不错，xhtml见效果页,我现在做的是二个菜单,如果需要添加,可把<ul class="collapsed" id="submenuid2">......</ul>之间的内容加上去,"submenuid"加1,查看效果。

CSS代码

body {
	margin: 0px;
	padding: 0;
	font: 12px " Arial, Helvetica, sans-serif;
	background: #FFFFFF;
	text-align: center;
}

ul{
	margin: 0;
	padding: 0;
	list-style: none;
}

#treenav {
	margin: 10px;
	text-align: left;
}

#treenav ul li {
	margin: 1px 0;
	padding: 0;
	font-size: 11px;
}

#treenav ul.expanded {
	display: block;
}

#treenav ul.expanded,#treenav ul.collapsed {
	margin: 5px 10px;
}

#treenav ul.collapsed {
	display: none;
}

.expanded li,.collapsed li{
	border-bottom: 1px dashed #CCCCCC;
	width: 100px;
}

.listhead {
	font-weight: bold;
	display: block;
	font-size: 12px;
	color: #333333;
	background: #F1F1F1;
	padding: 3px;
	width: 120px;
	margin: 1px 0;
}

#treenav a {
	text-decoration: none;
	color: #666666;
}

#treenav a:hover {
	color: #990000;
}

JS代码

function toggleMenu(id){
element = document.getElementById(id);
element.className = (element.className.toLowerCase() == 'expanded'?'collapsed':'expanded');
}
onload = function() {
toggleMenu('submenuid');
}