Unloading a movie / removeChild

I’m having some problems with loading and unloading external swf’s into a movieclip. I can load them in fine using the same variable and function, but when I load in the next one, instead of replacing the current content, it just overlays the new swf.

I have tried using removeChild, but am having problems.

Files can be found here:


Any assistance would be most appreciated! I’m pretty sure it is very simple…