Prova questo (si puo' fare di meglio ma comunque...)

codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<style type="text/css"> 
#menu { 
left:10; 
width:100; 
height:100; 
top:38; 
position:absolute; 
background-color:#000000; 
visibility:hidden; 
color:#ffffff 
} 

a {color:#ffffff} 
</style> 
<script > 
var style=".style"; 
var layer=".all"; 
var canClose = false;

function cambio(layerRef, stato) { 
eval("document" + layer + "['" + layerRef + "']" + style + ".visibility='" + stato + "'"); 
} 

function sCanClose() {
 if (canClose) {
  cambio('menu', 'hidden');
 }
}
</script> 

<body > 
<div name="menu" id="menu" onMouseOver="canClose = false;cambio('menu', 'visible')" onMouseOut="canClose = true;cambio('menu', 'hidden')"> 
<a href ="www.doppioclick.net" >Servizi</a> 

 
<a href ="www.doppioclick.net"  >Chat</a> 

 
<a href ="www.doppioclick.net"  >Tutorial</a> 

 
</div> 

<font color="orange">Visualizza Menu</font>


<script language="JavaScript" type="text/javascript">
<!--
window.setInterval('sCanClose()',1000);
//-->
</script>

</body>
</html>