Call function in 'holder' swf from CLICK in 'loaded' swf

What I want to achieve is this:

I have a swf with a bunch of buttons (or mc with buttonmode). This swf is loaded into a ‘holder’ swf with a URLRequest into a loader. These holders need to go into the Google network and have to contain a clickTAG. Since some of the buttons move around it would be nice if clicking on a button in the loaded swf would trigger the clickTAG function in the holder.

Any suggestion, pointer, tutorials are welcome.
Been searching for a while now, no success.

thnx