ActionScript 2.0 :: MotionTween - Ending Movement With Little Bounce

I've been doing Motion in Flash just per Hand doing MotionTween etc. But now I wanted finally to do a motion of a object with Actionscript. I wanted to move a object from one side to the other and let the movement end with a little bounce. Just like in the Example here: [URL]. I have already something which moves the object with slowing down at the end of the movement (onclip even on a MC):

Code:
onClipEvent(load){
zielx=0
_x=300
rate=10
}onClipEvent(enterFrame){
_x+=(zielx-_x)/rate
}
How I can let it end with a little bounce effect instead of the slowing down. Just like in the example.