where will it bounce?

[Seanx]

I'm making a 3D tennis game, and I'm trying to make a little indicator circle that will appear on the floor of the court at the location where the ball will bounce

my initial height is how high the ball was when it was struck, but here's where it gets tricky

y=360 is the floor of the court, so that y=0 is actually 360 pixels above the court

and I guess if you were to just turn my tennis court sideways temporarily, the z-axis movement (into and out of the screen) would become the x-axis for the purposes of solving for y=0 (y=360...)

I'm pretty sure I can factor out time - at least I'll try it, but at any rate, my fps for the movie is 46, and I've got the gravity at 1, which decrements (increases because of flash's inverted y-characteristics) the height of the ball each frame

I don't know how close to actual gravity 46 pixels downward each second would be with a scale of 15pixels = 1inch, but when I play the movie, it appears pretty lifelike

also - the y-velocity would be something around -20 to -30, depending on the z-velocity of the shot (faster = lower b.ymov to keep the ball in bounds)

just for approximation's sake, a y-velocity of 25 would correlate to a z-velocity of around 180 or so

At any rate, I'm not familiar enough with physics yet to know how to do a quick&dirty flash version of the projectile/parabola thingie so I know where to have flash put the circle on the ground

can anyone help me out with this? I'd really appreciate it!!!