Robert Penners Back button problem

Just wanted to quickly ask if anyone else has used Robert Penners Back button solution. It seems to work fine if everything is contained within the flash movie, but when loading external swf files into your main swf… getting that to work with the back button is a little fustrating. Trying to figure out a way to tell my movie if the variable equals a certain value then loadMovie… no luck yet. The only way I thought it might work is setting up a function in my flash movie and having my html page run that function when the back button is hit. Any ideas???
http://www.robertpenner.com/index2.html