Loading External SWF Problem

I followed the tutorial here on kirupa regarding the transition between SWFs. I don’t want transitions between them, but just to see how it is done to load them. I have working so the main.swf loads when the index.swf loads. The problem is though when I click a button, it doesn’t do anything. I am using the exact load code from the kirupa tutorial. Any ideas? Any code that can work that I can try? Let me know. Thanks.