Resize MC on .swf load

programming flash
1

I am wanting to make a gallery, and instead of the container mc just jumping to change size to fit the loaded contents, I am wanting it to scale tween between the two sizes.

e.g. a .swf that is 200x200 to a .swf that is 300x600

Currently I’m using the following code to load in my external.swf
s

on (press) {
_root.createEmptyMovieClip("blank_mc",100 );
with (_root.blank_mc){
_x=10;
_y=200;
}
loadMovie("xxx.swf", _root.blank_mc);
}

whats the easiest way to do this?

Thanks for your time,

-ollie