AS3: continially fire a function when mouse is held down?

I need to be able to continue to scroll through a sequence of images when the mouse is held down.  Right now when you click the button it only goes to the nextFrame or prevFram as you can see.  Please review my code and let me know if there is a simpler way of doing this.  

This is a sequence of 24 images that are run through causing the appearance of of a 360 rotation.  Drag works perfectly but what I need to do is be able to click and hold the mouse down and cause the piece to run through the images and if they hit the last frame to continue to rotate through...

Under a tight deadline so any help is greatly appreciated...

stop();
 
import gs.*;
import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;
try {
	photos.stop();
	pre_mc.y = -300;
	var startX:Number;
	var startFrame:int;
	var changeDistance:int;
	var travelDistance:int;
 
	TweenGroup.allTo([moveLeft_btn, moveRight_btn], .5, {alpha:.5, ease:Strong.easeIn});
 
	moveLeft_btn.addEventListener(MouseEvent.MOUSE_DOWN , moveLeftMouseDown);
	moveLeft_btn.addEventListener(MouseEvent.MOUSE_UP , moveLeftMouseUp);
	//stage.addEventListener(MouseEvent.MOUSE_UP , moveLeftMouseUp);
 
	function moveLeftMouseDown(MouseEvent) {
		photos.gotoAndPlay.nextFrame();
 
	}
	function moveLeftMouseUp(MouseEvent) {
 
	}
 
	moveRight_btn.addEventListener(MouseEvent.MOUSE_DOWN , moveRightMouseDown);
	moveRight_btn.addEventListener(MouseEvent.MOUSE_UP , moveRightMouseUp);
	//stage.addEventListener(MouseEvent.MOUSE_UP , moveRightMouseUp);
 
	function moveRightMouseDown(evt) {
		photos.gotoAndPlay.prevFrame();
 
	}
	function moveRightMouseUp(evt) {
 
	}
 
	moveLeft_btn.buttonMode = true;
 
	moveLeft_btn.addEventListener(MouseEvent.MOUSE_OVER,changeColor);
	moveLeft_btn.addEventListener(MouseEvent.MOUSE_OUT,changedColor);
 
	function changeColor(MouseEvent):void {
		moveLeft_btn.alpha = 1;
	}
	function changedColor(MouseEvent):void {
		moveLeft_btn.alpha = .5;
	}
	moveRight_btn.buttonMode = true;
 
	moveRight_btn.addEventListener(MouseEvent.MOUSE_OVER,changeColor1);
	moveRight_btn.addEventListener(MouseEvent.MOUSE_OUT,changedColor1);
 
	function changeColor1(MouseEvent):void {
		moveRight_btn.alpha = 1;
	}
	function changedColor1(MouseEvent):void {
		moveRight_btn.alpha = .5;
	}
 
	photos.buttonMode = true;
	photos.addEventListener(MouseEvent.MOUSE_DOWN,
	  pressHandler);
 
	function pressHandler(evt:MouseEvent):void {
		startX = photos.mouseX;
		startFrame = photos.currentFrame;
		photos.addEventListener(MouseEvent.MOUSE_MOVE,
		    moveHandler);
		stage.addEventListener(MouseEvent.MOUSE_UP,
		    releaseHandler);
	}
	function releaseHandler(evt:MouseEvent):void {
		photos.removeEventListener(MouseEvent.MOUSE_MOVE,
		    moveHandler);
		stage.removeEventListener(MouseEvent.MOUSE_UP,
		    releaseHandler);
	}
 
	function moveHandler(evt:MouseEvent):void {
		changeDistance = Math.round((photos.mouseX
		    - startX) / 18);
		travelDistance = startFrame + changeDistance;
		if (travelDistance > photos.totalFrames) {
			photos.gotoAndStop(travelDistance %
			      photos.totalFrames);
		} else if (travelDistance < 0) {
			photos.gotoAndStop(photos.totalFrames +
			      (travelDistance % photos.totalFrames));
		} else {
			photos.gotoAndStop(travelDistance);
		}
	}
} catch (error:TypeError) {
	trace("IOTypeError catch: " + error);
} finally {
	trace("Finally!");
}

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