Help with snow tutorial

I need help with the snow tutuorial in the Flash MX section. I am doing a project for school and I stumbled upon this site. Awesome site by the way =P. It’s been added to my favorites with flashkit. Anyways… I am doing a project in which the movie is an underwater setting. I have modified the snow to become bubbles, and even got the code to tell the bubbles to float up instead of fall down. The problem is… there seems to be lines of actionscript that tell the movie clip to duplicate somehow, and me having changed a + to a - seems to have messed this up. When I put the code back to normal the bubbles will continuously float down. Then when I change the code back to make the bubbles float up it messes up the code so that they don’t continuously float back up. I know this sounds confusing, so here is a link for the tutorial and my .fla file:

Tutorial------> Tutorial
My .fla-------> FLA

Thanks for the help if anyone can figure this out… It’s probably something really simple, but I’m not the most gifted when it comes to AS yet.

Thanks,
Vendian.