[Flash CS5] floating leaves/petals, need help!

What I’m trying to accomplish is to construct a movie clip using actionscripting. I have 6 small flower/petal .png’s to use, which i want to randomly spawn and waft down through the movie clip at the rate of falling snow, leaves or flower petals. Rotating would be a cool added effect, if that’s possible.

I checked around and havent been able to find a suitable tutorial for what i want to do. I tried your snow 2.0 tutorial and failed, then I tried the 3.0 snow tutorial, and it seems to be working for now, but I need help to get it to work, or maybe advice on an alternative way that would be easier to work with.

http://www.kirupa.com/developer/flash8/snow2.htm

I was going to make one movie clip for each png I want to use and just turn down the number of spawn frequency to see if I could get the achieved effect, a nice mix without the background being too cluttered.

Also this actionscript spawns the flower images halfway on the frame I want to apply it to. Since theres no movie clip to drag onto the scene and possition with this technique, and its all script based, how do I get it to spawn within the viewing window instead of half off to the side?

If I put a masking layer on top of this, will it mask the flowers into a specific area I want them to fall?