Google Maps Marker show popup from server side. how?

I'm using google maps in my site with markers.

When a marker is clicked, I'd like to display a popup.

this is easy, my problem is that the popup needs to be updated from the database before and the popup has some links that should be inside an UpdatePanel to avoid refresh.

Any idea on how to do this?

I can use the marker function to display a popup (with a given html) but I don't have any idea how to get the html with the updatepanel .

I thougt about using the ajax popup control but I don't know how to position it on the marker.

Someone probably impelemented this behavior.. help? :-)

Thanks.