R0J0hound, thank you very much!
I have some questions.
1- Please can you explain me how can I change the speed? Beacuse the ball it's to slow.
2- Is it possible add cursor/pointer/target at the end of trajectory line?
eg.
<img src="http://img703.imageshack.us/img703/3998/pointertargetcursor.jpg" border="0" />
Thank you! :)