loadMovie issues

I went ahead and used this tutorial to make a smooth transition between my external swf files: http://www.kirupa.com/developer/mx2004/transitions.htm

It works great, except for one issue. If I try and load an external swf while the preloader within the currently loading swf is active, nothing occurs. If I wait until the preoloader is finished and the rest of the swf begins to play, I can fade out the currently loaded swf at anytime and begin loading the new one.

My main is concern is that I would like the user to be able to unload a movie at any time, even if it is in the preloader stage, and load the selected one.

I used the code in the above tutorial as is. Any help is greatly appreciated. Let me know if I need to post anything else.