Can YOU help me with this problem? Web Development using jQuery

Can YOU help me with this problem? Web Development using jQuery

Scoured the Net. No one has even remotely tried this, at least not that I have found. Perhaps YOU could be the one to help me with this...
First of all, I can use jQuery for the typical, eye-candy slides, fades, tabs, blah blah blah. Yes, this is fun from a Designer standpoint, really fun, actually. Cool as this may be, lately I have found it irritating to try and find a good tutorial on using jQuery for Development. There are some simple ones out there , but nothing too complex. It's all just the same old stuff.
So, hopefully I still have your attention.
What I want to do is this:
Have ONE html page that has THREE links on it. The three links each call a different XML document. Depending on the link I click, I want to load its corresponding xml document, parse it, and display the data in this same html page.
Before I continue, I do know how to load a single xml document and parse it. The problem is, I, for the life of me cannot figure out how to pass the name of the xml document into the javascript, and I certainly cannot figure out how to pass this same name to the XMLHttpRequest object, so that I can load the xml document.
Here is an example of what I am talking about:
HTML source:
<div class="titles">
  <ul>
    <li><a href="#" onclick="getXML(beginner.xml)">Beginner</a></li>
    <li><a href="#" onclick="getXML(intermediate.xml)">Intermediate</a></li>
    <li><a href="#" onclick="getXML(advanced.xml)">Advanced</a></li>
  </ul>
</div>

Javascript:
jQuery(document).ready(function(){
    var xmlDoc = jQuery(".titles a").click(function(){

The XMLHttpRequest:
xmlhttp.open("GET","URL",false);

How would you
1. Send the address from the onclick in the link to the javascript,
2. Load that address into the "URL" of the xmlhttp.open

As I've said, I have scoured the Net in vain for a solution. Yes there are thousands of tutorials on AJAX, jQuery, How to load a single xml document using a Button, but I have not found one person out there who can tell me how to load an xml doc depending on which link I have clicked on a page.
All I want is a single, re-usable script that I can use to load multiple xml documents with. Sorry if I sound like a Noob on this, but I have tried every combination of keyphrases in my search until I have no idea what I am even talking about anymore!!