Setting external swf as background

i want to add a external swf to be a background of my swf.

then i want to be able to add a external swf over the top as well.

so 2 layers.

1 swf playing in the back and then another external swf over the top.

because as i have it now i cant add anything new to my old swf! and i need to keep it the same.

so i just want to add a new scroller at the bottom is all, over the old swf movie

can i do this with load movie?