Placing buttons in the "Over" state of another button

I’m testing out a method using AS2 to place two buttons on top of the
rollover image of another button.

I’m using a structure and script that I found elsewhere on the web,
but have one problem: I want the rollover image to remain active when
the pointer hovers and clicks on the two smaller buttons.

The .fla is here…

http://www.gwu.edu/~nsarchiv/flash/nested-test.fla

This is just a test, so the graphics are random.

The grey background image changes to the blue image on rollover.

The top and bottom grey buttons are both simply buttons that link to URLs – one links
to google and the other links to yahoo. The point is, I want the background
image to stay blue when the pointer moves over the grey buttons. As it it, it reverts back to the off state.

Any ideas? I’d really like to keep this in AS2 if possible.

Thanks!