XML Info Database Help

OK you may have seen my topic in 'HTML and Javascript' but I need all the help I can get.

So here is my problem:

I Need to be able to access file information by putting it in an XML file and parsing it w/ Javascritp or PHP (I chose Javascript because I Kinda know it.)

The System I have worked out right now is:
Click on product link --> a Window comes up and calls the XML file and displaying it on the same page.

But The problem is that The second window only calls the first piece of XML and I don't know how to get it to access a different section.

My code:

main Javascript file (script.js):

var xmlDoc;
function loadXML(){
//load xml file
// code for IE
if (window.ActiveXObject)
{
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async=false;
xmlDoc.load("product_info.xml");
getmessage();
}
// code for Mozilla, Firefox, Opera, etc.
else if (document.implementation && document.implementation.createDocument)
{
xmlDoc=document.implementation.createDocument("","",null);
xmlDoc.load("product_info.xml");
xmlDoc. /* I needed to make onload - onlaod for posting perposes  */ onlaod=getmessage;
}
else
{
alert('Your browser cannot handle this script');
}
}
// Actual message maker
function getmessage()
{
document.getElementById("name").innerHTML=xmlDoc.getElementsByTagName("name")[0].childNodes[0].nodeValue;
document.getElementById("file_size").innerHTML=xmlDoc.getElementsByTagName("file_size")[0].childNodes[0].nodeValue;
document.getElementById("summary").innerHTML=xmlDoc.getElementsByTagName("summary")[0].childNodes[0].nodeValue;
document.getElementById("version").innerHTML=xmlDoc.getElementsByTagName("version")[0].childNodes[0].nodeValue;
}
function dio(){
window.open("dio.html");
}

the second page/XML display page (dio.html):

the product download page only part of it (programs.html):

XML page (product_info.xml):

[ July 16, 2007: Message edited by: ian bert ]

This sounds like an HTML/Javascript problem too, so let's move it over there.