PHP Ajax call

Hi,

I need to show the contents of a web page on a different server (slightly modified) in my pages. I know how to do this (in a hackish fashion) in PHP, however, since I’m running Modx, I figured I should use the built in (or supplied with) Javascript libraries (MooTools?, Prototype, Scriptaculous). I’ve researched the Ajax.updater function, which seems to be part of the solution. However, I’m wondering where I should put the Javascript and PHP?
Ideally, I have a modx document showing a pulldown box. The actions related to the pulldown box should be an ajax call to a php page that retrieves and modifies the page. Can somebody point me to an example or any other hints?

Thanks.
sderuiter

look at moodjax (in the repository) or look at wrs.dospuntocero.cl, i’m using the included mootools version in modx to retrieve the content and a template variable (left image) using ajax...