Button in diffrent swf's

I have “main.swf” that is the main page
In “main.swf” is button “1” that has the action:
on (release) {
setProperty("/sub", _x, “20”);
setProperty("/sub", _y, “52.5”);
setProperty("/sub", _xscale, “100”);
setProperty("/sub", _yscale, “100”);
loadMovie(“bio/biobutton.swf”, “sub”);
}

In “bio/biobutton.swf” is a button “2” that should load “bio/biojorrit.swf” in a MC called “main” in the main page (“main.swf”)

Queston:
The action on button 2:
on (release) {
setProperty("/main", _x, “300”);
setProperty("/main", _y, “52.5”);
setProperty("/main", _xscale, “100”);
setProperty("/main", _yscale, “100”);
loadMovie(“bio/biojorrit.swf”, “main”);
}
Does not work because it’s in a diffrent swf. What actioncode should I use?

Cheers,
Jorrit Reuter