<style type="text/css">
body {
margin: 0px;
padding: 0;
font: 12px "Lucida Grande", Verdana, 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;
}
</style>
<script type="text/javascript">
function toggleMenu(id){
element = document.getElementById(id);
element.className = (element.className.toLowerCase() == 'expanded'?'collapsed':'expanded');
}
onload = function() {
toggleMenu('submenuid');
}
</script>
<ul id="treenav">
<li>
<ul>
<li><a href="somepage" onclick="toggleMenu('submenuid'); return false;" class="listhead">Products</a>
<ul class="expanded" id="submenuid">
<li><a href="#">Product11</a></li>
<li><a href="#">Product12</a></li>
<li><a href="#">Product13</a></li>
<li><a href="#">Product14</a></li>
<li><a href="#">Product15</a></li>
<li><a href="#">Product16</a></li>
</ul></li></ul>
<ul>
<li><a href="somepage" onclick="toggleMenu('submenuid2'); return false;" class="listhead">Services</a>
<ul class="collapsed" id="submenuid2">
<li><a href="#">Service11</a></li>
<li><a href="#">Service12</a></li>
<li><a href="#">Service13</a></li>
<li><a href="#">Service14</a></li>
<li><a href="#">Service15</a></li>
<li><a href="#">Service16</a></li>
</ul>
</li>
</ul>
</li>
</ul>
출처 : 대류님의 홈