Flash fountain script

Hi,
I’m new to as3 …
I’ve been trying to figure out this script

it’s very well done and very beautiful
What I’ve been trying to do is not only let the water drops splash on the ground but also from the side ways with gravity ofcours

but i can’t figure out how to make it splash on the sideways too instead of the water just go off the stage?

http://www.flashandmath.com/flashcs4/fountain/index.html

any help please ?