Problems - Transitioning btwn. External Swfs

Yeah, the one from the tutorial. I replaced the section1.swf, etc. files with my own swfs and renamed them accordingly. I open the mainmovie2004.swf, and it loads my first movie fine. The section 1-4 buttons do nothing, though. I’m pretty sure that the scripting on those is straight, so… Do I have to go back into the original FLAs and specify midframes? If so, do I do it with timeline markers, or AS? If it’s with AS, what’s the script?