Playing movieclips randomly

Hi,

I have this image, that has a bunch of little computer screens on it and I have made several small movie clips that “pulse” a glow. Trying to make the screens flicker. The pulse is just a 20 frame motion tween to fade a color in and out. I’m trying to get all these movieclips on stage (3 of them) to play randomly. Right now they all play at the same time and it looks odd.

Each movie clip has a “stop();” at the end. On the stage, i have a script layer where I have the following;

movieClip.onEnterFrame = function(){
if(Math.floor(Math.random()*50)==1)
this.play();
}

Doesn’t seem to do anything though. So all the movies play once, and then stop and don’t play again. Any help would be appreciated!

Cheers