Ball bounce up and down 1 time.

[tast]

I have used this code for getting a circle going from the top and down...

Now i want it to bounce back to the top but i don´t know how to integrate it to the code.

onClipEvent(load){
myscale=290;
}
onClipEvent(enterFrame)
{
_y +=(myscale - _y)/10;
}

I want the ball to bounce down and up ONLY one time.

Can anybody help me with this?
If anyone will explain how the code works(cause i´m no good at this Action Script),- i will be glad.

[tast]

By the way......

I have also been trying to make this jump to next frame when done......with no succes,- anyone know how to?

[pom]

Did you check this: http://www.kirupa.com/developer/actionscript/gravity.htm

[tast]

I think so.

But i think that the cool "gravity" thing keeps on bouncing.
And ActionScript is totaly new to me i don´t know how to fix it......

What i need is a ball that bounce only ONCE(up & down) and then go on to the next frame.