Why the snow flakes are exactly vertical?

Hey, guys!

Everything is ok? I hope so.

Well… This is my doubt (rss). I did a Kirupa´s tutorial (http://www.kirupa.com/developer/mx2004/snow.htm) about about) falling snow… Just for learning more about random animation.

What I do not understand is WHY the moviment of the snow is like this one:

http://www.ppwebart.com/testes/publish.swf

I did this tutorial with Flash 8, but it is not working… Is there some code here that just works at Flash 7?

Thanks a lot to all Kirupians!!