I need help with this script i got from dynamicdrive.com


my main issue is, that besides folding out like that, i need it to swap the image too. because i have created open and closed states for each of the buttons on there. i need it to do the current Jscript action, and swap the image, but i dont know enough javascripting to do that


heres the code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript">
if (document.getElementById){ //DynamicDrive.com change
document.write('<style type="text/css">\n')
document.write('.submenu{display: none;}\n')
document.write('</style>\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<ar.length; i++){
				if (ar[i].className=="submenu") //DynamicDrive.com change
				ar[i].style.display = "none";
			}
			el.style.display = "block";
		}else{
			el.style.display = "none";
		}
	}
}
</script>
<title>Untitled Document</title>
</head>
<body>
<!-- Keep all menus within masterdiv-->
<div id="masterdiv">
	<div><img src="nav_test/home.jpg" border="0"></div>
	<div onclick="SwitchMenu('sub1')"><img src="nav_test/nav_home.jpg" border="0"></div>
	<span class="submenu" id="sub1">
		- <a href="new.htm">What's New</a><br>
		- <a href="hot.htm">What's hot</a><br>
		- <a href="revised.htm">Revised Scripts</a><br>
		- <a href="morezone/">More Zone</a>
	</span>
	<div onclick="SwitchMenu('sub2')"><img src="nav_test/nav_services.jpg" border="0"></div>
	<span class="submenu" id="sub2">
		- <a href="notice.htm">Usage Terms</a><br>
		- <a href="faqs.htm">DHTML FAQs</a><br>
		- <a href="help.htm">Scripts FAQs</a>
	</span>
	<div onclick="SwitchMenu('sub3')"><img src="nav_test/nav_products.jpg" border="0"></div>
	<span class="submenu" id="sub3">
		- <a href="<A href="http://www.codingforums.com">coding/">http://www.codingforums.com">Coding Forums</a><br>
	</span>
	
	<div onclick="SwitchMenu('sub4')"><img src="nav_test/nav_support.jpg" border="0"></div>
	<span class="submenu" id="sub4">
		- <a href="<A href="http://www.javascriptkit.com">javascript/">http://www.javascriptkit.com">JavaScript Kit</a><br>
		- <a href="<A href="http://www.freewarejava.com">freewarejava</a><br">http://www.freewarejava.com">Freewarejava</a><br>
		- <a href="<A href="http://www.cooltext.com">cool/">http://www.cooltext.com">Cool Text</a><br>
		- <a href="<A href="http://www.google.com">google.com</a">http://www.google.com">Google.com</a>
	</span>
	<div onclick="SwitchMenu('sub5')"><img src="nav_test/nav_download.jpg" border="0"></div>
	<span class="submenu" id="sub5">
		- <a href="<A href="http://www.dynamicdrive.com/link.htm">Link">http://www.dynamicdrive.com/link.htm">Link to DD</a><br>
		- <a href="<A href="http://www.dynamicdrive.com/recommendit/">Recommend">http://www.dynamicdrive.com/recommendit/">Recommend Us</a><br>
		- <a href="<A href="http://www.dynamicdrive.com/contact.htm">Email">http://www.dynamicdrive.com/contact.htm">Email Us</a><br>
	</span>
	<div onclick="SwitchMenu('sub6')"><img src="nav_test/nav_contact.jpg" border="0"></div>
	<span class="submenu" id="sub6">
		- <a href="<A href="http://www.dynamicdrive.com/link.htm">Link">http://www.dynamicdrive.com/link.htm">Link to DD</a><br>
		- <a href="<A href="http://www.dynamicdrive.com/recommendit/">Recommend">http://www.dynamicdrive.com/recommendit/">Recommend Us</a><br>
		- <a href="<A href="http://www.dynamicdrive.com/contact.htm">Email">http://www.dynamicdrive.com/contact.htm">Email Us</a><br>
	</span>
</div>
</body>
</html>

I don't know any java or java script but I can at least share with you some code that does what you looking for.
The files needed are in a package that can be downloaded from here:
http://www.webdesignskolan.com/javascripts/javaapplets/menyer/dellastreeapplet/dltree101.zip

And the code to be used in the web page in the body is like this:

<APPLET CODE="TreeApplet" NAME="TreeApplet" WIDTH="220" HEIGHT="340">
<PARAM NAME="Copyright" VALUE="(c)1998 Robert Della Malva (robdella@webshuttle.ch)">
<PARAM NAME="Tree_ScriptFile" VALUE="os_script.txt">
<PARAM NAME="Tree_DefaultUrlTarget" VALUE="_self">
<PARAM NAME="Tree_MouseOverLinkSound" VALUE="drip.au">
<PARAM NAME="Tree_MouseOverMenuSound" VALUE="drip.au">
<PARAM NAME="Tree_MouseClickLinkSound" VALUE="piano.au">
<PARAM NAME="Tree_MouseClickMenuClosedSound" VALUE="chirp.au">
<PARAM NAME="Tree_MouseClickMenuOpenSound" VALUE="return.au">
</APPLET>

The names(values) in the code above are in swedish but that shouldn't be too confusing I think.
Good luck!

I've use it at website mega bonus. The code is very short and optimized, look:

function rede(num, acao, obj) {
	quadro = document.getElementById("quadro-exemplos");
	if(acao==1) {
		if(navigator.appVersion.indexOf("MSIE") != -1) {
			arrVersao = navigator.appVersion.split("MSIE"); 
			if (parseFloat(arrVersao[1]) < 7) obj.style.backgroundColor = "#f7fff6";
		}
		quadro.style.background = 'url(/images/loading.gif) center no-repeat';
		if(num == 1) quadro.innerHTML = '<img src="/images/exemplo-rede-pequena.gif" alt="Exemplo de Círculo de Relacionamento Pequeno" />';
		if(num == 2) quadro.innerHTML = '<img src="/images/exemplo-rede-media.gif" alt="Exemplo de Círculo de Relacionamento Médio" />';
		if(num == 3) quadro.innerHTML = '<img src="/images/exemplo-rede-grande.gif" alt="Exemplo de Círculo de Relacionamento Grande" />';
		if(num == 4) quadro.innerHTML = '<img src="/images/exemplo-rede-mega.gif" alt="Exemplo de Círculo de Relacionamento Mega" />';
	} else {
		if(navigator.appVersion.indexOf("MSIE") != -1) {
			arrVersao = navigator.appVersion.split("MSIE"); 
			if (parseFloat(arrVersao[1]) < 7) obj.style.backgroundColor = "#F8FCFF";
		}
		quadro.style.background = '';
		quadro.innerHTML = '<p>Passe o mouse sobre um dos exemplos à esquerda.</p>';
	}
}
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