Question about accessing properties of a loaded external swf

On my website http://www.stevestalder.com I have a scrollbar on my portfolio page that I would like to include on every page but I am having a problem determing the height of the loaded swf files.

My structure for the flash is this:

main.swf file which loads everything.

Then I have 4 swf files for my pages (home.swf, portfolio.swf, etc) which are loaded by the MovieClipLoader class with a preloader.

PHP Code:

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var my_mc:MovieClipLoader = new MovieClipLoader();
my_mc.loadClip('portfolio.swf', mc_holder); 


---

mc_holder is on the stage of my main swf which loads the content of my other swf files for the pages.

Any suggestions on how I can access the properties of those loaded swf files. Even if I have to create a movieclip in each of the files called mc_container or something similar I can do that.

Sorry it this isnt clear, let me know and I will explain a little more. Thanks.