Stopping and playing a movieClip. Help please

Hei,
I have a MC with this code as a simple animation:
[AS]
onClipEvent(load){
this._alpha=0;
}
onClipEvent(enterFrame){
this._alpha=Math.random()*90;
}
[/AS]
Can I have some control on stopping and playing this MC from the timeline?
I have tried MC.stop(); in a frame in the timeline but the movieClip is still playing.
mx-guest2004

You have to dele the enterFrame function, here is an example