Load movie with button problem?

I have a weird problem. I have the main movie loading an external movie into a container. The external movie has a button which I want to load another external movie into the same container. I figured that much out. But the first loaded external movie has a snow effect action script. When the button is pressed the next movie loads but the snow effect is also on the next loaded movie. I cant figure out how to stop that action script from happening on the next externally loaded movies. I hope this makes some sense.
TIA for any and all replies.