D7 Google Maps

Hello all,

I'm working on a Google Map that is rendered via a custom module's theme() implementation. The problem I'm running into is being able to dynamically add / remove / update markers on the map based on the values from a custom form (built with FAPI). That is, without reloading the page - just by targeting the map in a callback.

I'm trying to do so with an AJAX callback, (#ajax attribute on form submit) but am having difficulty with the AJAX callback system. It's easy enough to add / replace elements on the page with it, but I want to pass the form ($_POST) values to the callback and add / change the map markers instead.

Is this something that I'd need to do with JS Behaviors instead? I would really appreciate anyone who could spread some light on this. Here's an example of the kind of thing I'm trying to create: http://www.scripps.org/locations

Thanks!