onClipEvent(load) Problem

I have an intro SWF on my a website that has a running menu across the bottom for various features. Each of those menu items calls an external movie, and so far I've been able to keep this simple by placing a loadMovie statement in the item's frame, such as hands_mc.loadMovie("hands.swf");. I ran into a problem, though, when a particular imported movie was built using setInterval functions. It's a simple slideshow with six images and I want each image to pause for 5 seconds before motion (alpha) tweening to the next image. I loaded this into the timeline frame for that item as I did all the others. The problem is that once that movie is loaded, the setInterval action seems to go global and the whole intro movie begins playing each item at 5 second durations. This is the setInterval code I'm using in the imported movie:
stop();
function pause() {
clearInterval(pauseThis);
play();
}
pauseThis = setInterval(pause, 5000);

So I tried to resolve the problem by placing a load script in the root movie clip itself, but now can't get the movie to load at all. This is the code I'm putting into the clip:

onClipEvent (load) {
customweb_mc.loadMovie("customweb.swf");      
}

The  movie being loaded is in the same directory as the intro movie. The site is http://www.cayceweb.com. The item in question is "Custom Web Design". If you go there, you'll notice it still has the setInterval version in place. Click on the link and the movie plays fine. Click another link and they all start cycling through at five second intervals. Maybe I should do some kind of unLoad for that movie? Guessing again.

Thanks for any and all help.

Cayce