Filter markers without map reloading

Hello,

I am quite new to Drupal so sorry if my question looks a bit easy, but after several days of struggling I can't find the solution.

I have set up a google map under Drupal 6 with Gmap, Views and Location modules. I am referencing different content-types as markers on the map and filtering with 2 exposed filters: one by content-type and one by taxonomy terms.

The problem is the whole map is reloaded every time a filter value is changed by the user. I want to avoid the reload of the map, and get the filters to change dynamically the markers on the map. I activated Ajax on the view but it's not working as I expected (it's just reloading the map instead of the whole page). Does this functionnality already exists? What kind of solution should I look for?

As an example, I would like to get something like this: http://www.opengreenmap.org/en/greenmap

Thanks for your help,
Alex