Rollover en menú expandible

Gente, tengo un menu expandible y el tema es que no puedo ha cer que que tenga un rollover, aca dejo el codigo para ver si tiran una onda.
Saludos y gracias.

<code>
CSS

&lt;style&gt;
.menutitle{
cursor:pointer;
margin-bottom: 5px;
background-color:#ECECFF;
color:#000000;
width:140px;
padding:2px;
text-align:center;
font-weight:bold;
/*/*/border:1px solid #000000;/* */
}

.submenu{
margin-bottom: 0.5em;
}
&lt;/style&gt;</code>

<code>
JAVA

&lt;script&gt;

/***********************************************
* Switch Menu script- by Martial B of http://getElementById.com/
* Modified by Dynamic Drive for format &amp; NS4/IE4 compatibility
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

var persistmenu="yes" //"yes" or "no". Make sure each SPAN content contains an incrementing ID starting at 1 (id="sub1", id="sub2", etc)
var persisttype="sitewide" //enter "sitewide" for menu to persist across site, "local" for this page only

if (document.getElementById){ //DynamicDrive.com change
document.write('&lt;style&gt;\n')
document.write('.submenu{display: none;}\n')
document.write('&lt;/style&gt;\n')
}

function SwitchMenu(obj){
if(document.getElementById){
var el = document.getElementById(obj);
var ar = document.getElementById("masterdiv").getElementsByTagName("span"); //DynamicDrive.com change
if(el.style.display != "block"){ //DynamicDrive.com change
for (var i=0; i&lt;ar&gt; 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) {
offset += search.length
end = document.cookie.indexOf(";", offset);
if (end == -1) end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}

function onloadfunction(){
if (persistmenu=="yes"){
var cookiename=(persisttype=="sitewide")? "switchmenu" : window.location.pathname
var cookievalue=get_cookie(cookiename)
if (cookievalue!="")
document.getElementById(cookievalue).style.display="block"
}
}

function savemenustate(){
var inc=1, blockid=""
while (document.getElementById("sub"+inc)){
if (document.getElementById("sub"+inc).style.display=="block"){
blockid="sub"+inc
break
}
inc++
}
var cookiename=(persisttype=="sitewide")? "switchmenu" : window.location.pathname
var cookievalue=(persisttype=="sitewide")? blockid+";path=/" : blockid
document.cookie=cookiename+"="+cookievalue
}

if (window.addEventListener)
window.addEventListener("load", onloadfunction, false)
else if (window.attachEvent)
window.attachEvent("onload", onloadfunction)
else if (document.getElementById)
window.onload=onloadfunction

if (persistmenu=="yes" &amp;&amp; document.getElementById)
window.onunload=savemenustate

&lt;/script&gt;
</code>

<code>
HTML

&lt;div&gt;

&lt;div&gt;Site Menu&lt;/div&gt;
&lt;span class="submenu" id="sub1"&gt;
- &lt;a href="new.htm"&gt;What's New&lt;/a&gt;&lt;br&gt;
- &lt;a href="hot.htm"&gt;What's hot&lt;/a&gt;&lt;br&gt;
- &lt;a href="revised.htm"&gt;Revised Scripts&lt;/a&gt;&lt;br&gt;
- &lt;a href="morezone/"&gt;More Zone&lt;/a&gt;
&lt;/span&gt;

&lt;div&gt;FAQ/Help&lt;/div&gt;
&lt;span class="submenu" id="sub2"&gt;
- &lt;a href="notice.htm"&gt;Usage Terms&lt;/a&gt;&lt;br&gt;
- &lt;a href="faqs.htm"&gt;DHTML FAQs&lt;/a&gt;&lt;br&gt;
- &lt;a href="help.htm"&gt;Scripts FAQs&lt;/a&gt;
&lt;/span&gt;

&lt;div&gt;Help Forum&lt;/div&gt;
&lt;span class="submenu" id="sub3"&gt;
- &lt;a href="http://www.codingforums.com"&gt;Coding Forums&lt;/a&gt;&lt;br&gt;
&lt;/span&gt;

&lt;div&gt;Cool Links&lt;/div&gt;
&lt;span class="submenu" id="sub4"&gt;
- &lt;a href="http://www.javascriptkit.com"&gt;JavaScript Kit&lt;/a&gt;&lt;br&gt;
- &lt;a href="http://www.freewarejava.com"&gt;Freewarejava&lt;/a&gt;&lt;br&gt;
- &lt;a href="http://www.cooltext.com"&gt;Cool Text&lt;/a&gt;&lt;br&gt;
- &lt;a href="http://www.google.com"&gt;Google.com&lt;/a&gt;
&lt;/span&gt;

&lt;img src="about.gif"&gt;&lt;br&gt;
&lt;span class="submenu" id="sub5"&gt;
- &lt;a href="http://www.dynamicdrive.com/link.htm"&gt;Link to DD&lt;/a&gt;&lt;br&gt;
- &lt;a href="http://www.dynamicdrive.com/recommendit/"&gt;Recommend Us&lt;/a&gt;&lt;br&gt;
- &lt;a href="http://www.dynamicdrive.com/contact.htm"&gt;Email Us&lt;/a&gt;&lt;br&gt;
&lt;/span&gt;

&lt;/div&gt;
</code>