Levels in loaded swf file

This is a major headache.
The main swf file of my site loads other swf files into it. Nothing hard there!
But one of these loaded swf’s has a number of buttons and what I need it to do is load aditional swf’s into ‘levels’ of that file (not the main swf).
I just can’t seem to do it. Everything works fine but the swf’s load into the main swf meaning they overlap areas that I don’t want them to appear in.
Does anyone have any idea if;

  1. You can load into levels within a loaded swf.
  2. Does each swf have its own levels or do we have to use only one set of levels that are in the main swf.
  3. And if they do have their own levels, how on earth do I tell it to load into them.

My AS is as simple as this;

loadMovieNum(“quail01.swf”, portvar);

portvar is a variable.

As I say it works fine when testing it within this swf, but as soon as I use the ‘main swf’, it loads into that files levels.

Thanks.