Customizing Snow 2.0 tutorial

I’m messing around with the Snow 2.0 tutorial at:

http://www.kirupa.com/developer/mx2004/snow.htm

How would I modify the code so that the _x of the snowflakes is not effected by the position of the mouse cursor? Ideally, the snow would just fall from left to right, but not like there was a big storm. Any suggestions would be appreciated.

Thanks.