Stopping the Snow Fall!

I guess it’s now this time of the year and the snow tutorial becomes the favourite, huh?

I am after some help, if I may.

I have created some snowfall using the tutorial at: http://www.kirupa.com/developer/flashcs4/falling_snow_as3_cs4_pg1.htm

It is part of a looping presentation and I want the snow fall to stop when the presentation loops but the function carries on going? Can someone give me a pointer as to how I might stop this happening?

Thanks for the great tutorial, it’s been a huge help.

Chris