Math help

Ive hit the limitation of my math and searching abilities...

How can I calculate how to throw something in a perfect arch from point (x1,y1) to (x2,y2)? 
I can imagine doing this with gravity enabled and use force to push at an angle, but not how to calculate the angle and force needed

This Extension by Merrak might interest you :
http://community.stencyl.com/index.php/topic,44858.0.html

This may help. Been  a while since i touched physics side ot the house.

http://www.physicslearningsite.com/projectile.html

Thank you both!   That extension is perfect.

And I somehow escaped college with a degree and not having to take calculus, but Im going to try and learn from that site