Help with transitions of external swfs

I am using this scripting for my website. http://www.kirupa.com/developer/mx2004/transitions.htm I have used it on other websites successfully, but the website I’m working on now is a little more complicated and the scripting is not working correctly.

Before I had simple buttons on the root level, but now I have complex rollover buttons in side movieclips playing on the root level. When I go to test the site in Flash 8, it works fine, but then when i publish the files and open it in a browser, it is not loading the external swfs into the main swf. All the files are in the same folder as the main swf and I am not using any other folders.

Does anyone have experience with this method of attaching and transitioning of external swfs?

Or is there a better and simple way to achieve this same function?

Thanks!