Tree Menu script - Help!

I have a basic tree menu script, but its broken and makes it really fat.
Help!

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<FONT style="FONT-WEIGHT: normal; FONT-SIZE: 10px; COLOR:000000 ; FONT-FAMILY: Verenda; LETTER-SPACING: 1px"><style>
<!--
#foldheader{cursor:pointer;cursor:hand ; font-weight:normal ;
list-style-image:url(fold.gif)}
#foldinglist{list-style-image:url(list.gif)}
//-->
</style>
<script language="JavaScript1.2">
<!--

//Smart Folding Menu tree- By Dynamic Drive (rewritten 03/03/02)
//For full source code and more DHTML scripts, visit http://www.dynamicdrive.com
//This credit MUST stay intact for use

var head="display:''"
img1=new Image()
img1.src="fold.gif"
img2=new Image()
img2.src="open.gif"

var ns6=(document.getElementById&&!document.all||windo w.opera)
var ie4=document.all&&navigator.userAgent.indexOf("Ope ra")==-1

function checkcontained(e){
var iscontained=0
cur=ns6? e.target : event.srcElement
i=0
if (cur.id=="foldheader")
iscontained=1
else
while (ns6&&cur.parentNode||(ie4&&cur.parentElement)){
if (cur.id=="foldheader"||cur.id=="foldinglist"){
iscontained=(cur.id=="foldheader")? 1 : 0
break
}
cur=ns6? cur.parentNode : cur.parentElement
}

if (iscontained){
var foldercontent=ns6? cur.nextSibling.nextSibling : cur.all.tags("UL")[0]
if (foldercontent.style.display=="none"){
foldercontent.style.display=""
cur.style.listStyleImage="url(open.gif)"
}
else{
foldercontent.style.display="none"
cur.style.listStyleImage="url(fold.gif)"
}
}
}

if (ie4||ns6)
document.onclick=checkcontained

//-->
</script>

<FONT style="FONT-WEIGHT: normal; FONT-SIZE: 10px; COLOR:000000 ; FONT-FAMILY: Verenda; LETTER-SPACING: 1px">

<ul>
<li id="foldheader">Navigation</li>
<ul id="foldinglist" style="display:none" style="&{head};">

<li><a href="PAGE URL">page name</a></li>

<li><a href="PAGE URL">page name</a></li>

<li><a href="PAGE URL">page name</a></li>

<li><a href="PAGE URL">page name</a></li>

</ul>


</ul></FONT></FONT>

Anyone help?

Also it MUST be HTML.

[Jamie.]

Live preview?

[Verrou]

The closest script on DD i could find:
http://www.dynamicdrive.com/dynamicindex1/navigate1.htm