Here's a quick slider bar thing. Create a movie clip that will act as you moving bar, place it on the stage where you want it to be located when that animation is at the start and add this code to it:

Code:
onClipEvent(load) {
	startX = this._x;
	sliderAreaSize = 200;
	contentMC = _root.animationMC;
	
	this.onPress = function() {
		contentMC.stop();
		this.onMouseMove = function() {
			var frame = Math.round(contentMC._totalframes * (this._parent._xmouse-startX)/sliderAreaSize);
			if (frame < 1) {
				frame = 1;
			} else if (frame > contentMC._totalframes) {
				frame = contentMC._totalframes;
			}
			contentMC.gotoAndStop(frame);
		}
	}
	this.onRelease = this.onReleaseOutside = function() {
		this.onMouseMove = null;
		contentMC.play();
	}
}

onClipEvent(enterFrame) {
	var scale = contentMC._currentframe/contentMC._totalframes;
	this._x = startX + scale*sliderAreaSize;
}
You need to change sliderAreaSize, this is the length of the slider, meaning it's the distance the bar movie clip will move.

You also need to change contentMC so it points to the movie clip containing the animation. The code above will only work if your animation is on the main timeline and the instance is called animationMC.