Kirupa Tutorial: falling snow help

Hello,

I really like the falling snow effect and taken the tutorial(I’m new to actionscript but keen on learning it)

I would like to incorperate this falling objects effect into my site and find that no matter what layer I put them(falling objects) they are always on top.

I can’t seem to mask them

Hows it done Oh mighty flash people?

I have them within the main background movie and not as external SWFs. Is that ok?