I think you're asking if you can use it on a script which is on the main timeline. Yes you can. Let's say there is a movieclip called 'mc'. Here is a more fleshed out version of that script.

code:


mc.target = 200;

mc.speed = 2;



mc.onEnterFrame = function()

{

  var dx = this.target - this._x;

  if (Math.round(dx) == 0)

  {

    this._x = this.target;

    delete this.onEnterFrame;

  }

  else {

    this._x += dx / this.speed;

  }

}