Download the two javascript classes needed for this script, "com.bydust.ajax" and "com.bydust.array".

Download the documentation website for a working example.
The script will work when hosted on any server, but not if you'll run it straight from your harddrive.

You can use the code below if you'd like to link back to me. I'll add you to the list of users then, with a link to your site.
<a href="http://www.bydust.com/examples/com.bydust.ajax/" title="This website is powered by the com.bydust.ajax class" target="_blank"><img src="http://www.bydust.com/examples/com.bydust.ajax/images/bydust.ajax_button_88x12.jpg" width="88" height="12"/></a>

It would look like this: