Scratch

To bounce a ball you can do with Macromedia Flash or Adobe Flash Player, using the motion guide. If these familiarizadon flash laprimera create 2 layers in the circle and draw another curved line adds in the way you want, according to the curves of the line the ball will follow the trajectory of this line, then you right click the layer and Press desired se-lected and "add guide movement."

Try checking if you can not do it, show me to attach an example.
http://www.dreamsoftperu.net