Animation, when objects overlap, overlapped area turns different color?

Question

I'm designing a flash version of this site;
http://www.1gdomains.com/
The main logo is made up of a '1' and a 'G'. In my animation,
I want the '1' to come down from the top and settle in the center
of the page. I then want my 'G' to come from the right and move
into position, overlapping the '1'.
I know how to do this with a simple time frame based
animation, but how can I make it so that as the 'G' moves over the
'1' and starts to overlap, the overlapped area turns white? I want
the end of the animation to look like the site I liked above.
thanks
james

Answer 1

Ive got a movie called ‘1’ where the 1 comes from
from the top and stops in the center.
Ive also got a movie called ‘G’ where the G comes
from the right and stops in the center.
Ive got a top level movie called holderboth.
In that Ive got a movie called holder1, and holderG.
In holder1 the 1 gets a chunk taken out of it by the G, and
in holderG the G gets a chunk taken out by the 1.
If holder1 and holderG are some distance apart then they work
fine. Both the 1 and the G move and then have a chunk taken out of
them at the end. When I have them overlapping however, so they
finish in the position they need to, one will completely erase the
other!
I think I understand why this is happening. I think the
‘1’ or ‘G’ which is set to erase is not
just erasing in its holder but also the other holder. How can I
turn this off though?