Impossible external loader??? (HELP!)

Hi!

I have an extremely interesting problem. I try to describe it for you:

I have a movie. It has a menu with buttons. With one of these buttons, I can load an external movie into the sprite which is on this base movie.

Ok... the new swf is loaded perfectly. On this new movie, there are container sprites. Every one of them load into themselves ANOTHER external movie instantly. Every pieces of these movies contain only one single button.

Now... I want to tell the browser, if I click one of these buttons than load ANOTHER external movie into the very first movie's container sprite.

I hope you understand my problem. Sorry for my english. :)

Please help!