Populating A Listbox From XML List?

I've been working on a listbox full of employees for our company intranet. Each name has an onchange tag that calls up a floor map and that part works fine but I'd really like to populate the names from an XML list so it's easier for non-IT people to maintain.I've been doing alot of web searches on the subject which comes up alot but it's mostly just fragments of what I need being that I've got no javascript background.I found a helpful tutorial on javascriptkit but that wasn't for creating listboxes so I'm only part of the way there. The most important parts are the name which will be used as the text of the box and the office number which will determine which floorplan is displayed.I added the other information so I can potentially put it in a div display later but that can wait.