// JavaScript Document
window.onload=montre;
function montre(id) {
var d = document.getElementById(id);
for (var i = 1; i<=500; i++) {
if (document.getElementById('smenu'+i))
{document.getElementById('smenu'+i).style.display='none';}
}
if (d) {d.style.display='block';}
}
window.onload=cache;
function cache(id) {
var d = document.getElementById(id);
for (var i = 1; i<=500; i++) {
if (document.getElementById('smenu'+i))
{document.getElementById('smenu'+i).style.display='none';}
}
if (d) {d.style.display='none';}
}
window.setTimeout("cache()",6000);

<dl><dt onmouseover="javascript:montre('smenu2');"><a href="#">Menu2</a></dt>
<dd id="smenu2">
<ul>
<li onmouseover="javascript:montre('smenu2');" onmouseout="javascript:cache('smenu2');"><a href="#">S-Menu2-1</a></li>
<li onmouseover="javascript:montre('smenu2');" onmouseout="javascript:cache('smenu2');"><a href="#">S-Menu2-2</a></li>
</ul>
</dd></dl>

window.setTimeout("cache()",6000);