Flash root Movie Resize Problem

Question

Greetings ladies and gentlemen,
I have been going round and round in circles, trying to solve
this annoying little problem, and have just ended up biting myself
in the small of the back. I need help from someone who really knows
their flash.
My problem is this - I have a parent flash movie of size
900x800. I have a button inside this parent that then loads an
external swf (size 300x200) into an empty mc in the parent. My
problem is that when the external swf loads, it resizes the parent
movie (or repositions it depending on whether I am using IE or
Firefox).
I can't seem to work out why or how it's happening, and it
happens whether I use the standard Flash embedding or the swfobject
method for my HTML page that the movie is embedded in.
The actionscript code in the parent is very basic:
but1.onRelease = function() {
_root.createEmptyMovieClip("mp3_player",
getNextHighestDepth());
mp3_player._x = 240;
mp3_player._y = 390;
mp3_player.loadMovie("mp3player.swf");
I can't imagine why the root movie jumps down in size when
the button is pressed and the external swf loaded. Please, could
anyone shed some light?
My html file has the following embedding:

Answer 1

Yep. I have the same problem and I have searched every forum
on the web and have spent hours messing with AS. If anyone has a
clue please throw us a bone.
Thanks,
Dr-Clegg