this is a panel

public void class Foo {
}

{style}
<!-- 
/* CSS issu des tutoriels www.alsacreations.com/articles */
body {
margin: 0;
padding: 0;
background: white;
font: 80% verdana, arial, sans-serif;
}
dl, dt, dd, ul, li {
margin: 0;
padding: 0;
list-style-type: none;
}
#menu {
}
dl#menu {
width: 15em;
}
dl#menu dt {
cursor: pointer;
margin: 2px 0;;
height: 20px;
line-height: 20px;
text-align: center;
font-weight: bold;
border: 1px solid green;
background: lime;
}
dl#menu dd {
border: 1px solid green;
}
dl#menu li {
text-align: center;
background: #fff;
}
dl#menu li a, dl#menu dt a {
color: #000;
text-decoration: none;
display: block;
border: 0 none;
height: 100%;
}

dl#menu li a:hover, dl#menu dt a:hover {
background: #eee;
}

#mentions {
font-family: verdana, arial, sans-serif;
position: absolute;
bottom : 200px;
left : 10px;
color: #000;
background-color: #ddd;
}
#mentions a {text-decoration: none;
color: #222;
}
#mentions a:hover{text-decoration: underline;
}

-->
{style}
{html}
<script type="text/javascript">
<!--
window.onload=montre;
function montre(id) {
var d = document.getElementById(id);
	for (var i = 1; i<=10; i++) {
		if (document.getElementById('smenu'+i)) {document.getElementById('smenu'+i).style.display='none';}
	}
if (d) {d.style.display='block';}
}
//-->
</script>

<dl id="menu">

		<dt onclick="javascript:montre();"><a href="#">Menu 1</a></dt>
			
		<dt onclick="javascript:montre('smenu2');">Menu 2</dt>
			<dd id="smenu2">
				<ul>
					<li><a href="#">Sous-Menu 2.1</a></li>
					<li><a href="#">Sous-Menu 2.2</a></li>

					<li><a href="#">Sous-Menu 2.3</a></li>
				</ul>
			</dd>	

		<dt onclick="javascript:montre('smenu3');">Menu 3</dt>
			<dd id="smenu3">
				<ul>
					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>

					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>
				</ul>
			</dd>

		<dt onclick="javascript:montre('smenu4');">Menu 4</dt>
			<dd id="smenu4">
				<ul>
					<li><a href="#">Sous-Menu 4.1</a></li>
					<li><a href="#">Sous-Menu 4.1</a></li>
				</ul>
			</dd>

	
</dl>

{html}