AS3 CS4 addEventListener not listening

programming flash
1

Being a Newbie, all I want to do now is to have total of 3 head graphics showing at one time - then when mouseover or rollover of one of the head images have the other head images disappear, plus add a information graphic beside of the head.
Very greatfull for help with this,
Thankyou.

SEE BELOW

import flash.display.MovieClip;
import flash.events.MouseEvent;

addEventListener(Event.ENTER_FRAME, frameNumber);

function frameNumber(evt:Event):void {
var frames:Number;
frames=currentFrame;
if (frames==166) {
AboutHeadRollOver();
}
function AboutHeadRollOver():void {
var images:Array = [“Dave-head.gif”, “DaveAbout.gif”,
“Daniel-head.gif”, “DanielAbout.gif”]

   // image 1

var DaveHead1:Loader = new Loader();
DaveHead1.load(new URLRequest(images[0]));
addChild(DaveHead1);
DaveHead1.x=111.50;
DaveHead1.y=113.00;
DaveHead1.alpha=1;

DaveHead1.addEventListener(MouseEvent.MOUSE_OVER, DaveMouseOverHandler);
DaveHead1.addEventListener(MouseEvent.MOUSE_OUT, DaveMouseOutHandler);

// image 2
var DaveAbout:Loader = new Loader();
DaveAbout.load(new URLRequest(images[1]));
addChild(DaveAbout);
DaveAbout.x=111.50;
DaveAbout.y=113.00;
DaveAbout.alpha=0;

   // image 3

var DanielHead1:Loader = new Loader();
DanielHead1.load(new URLRequest(images[2]));
addChild(DanielHead1);
DanielHead1.x=292.30;
DanielHead1.y=216.85;
DanielHead1.alpha = 1;

   // image 4

var DanielAbout:Loader = new Loader();
DanielAbout.load(new URLRequest(images[3]));
addChild(DanielAbout);
DanielAbout.x=111.50;
DanielAbout.y=113.00;
DanielAbout.alpha=0;

function DaveMouseOverHandler(e:MouseEvent):void {
trace(“Inside Dave Mouse Over Handler”);
DaveHead1.alpha = 1.0;
DanielHead1.alpha = 0;
DaveAbout.alpha = 1.0;
}
function DaveMouseOutHandler(e:MouseEvent):void {
DanielHead1.alpha = 1.0;
DaveHead1.alpha = 1.0;
DaveAbout.alpha = 0;
}

DanielHead1.addEventListener(MouseEvent.MOUSE_OVER, DanielMouseOverHandler);
DanielHead1.addEventListener(MouseEvent.MOUSE_OUT, DanielMouseOutHandler);

function DanielMouseOverHandler(e:MouseEvent):void {
DaveHead1.alpha = 0;
DanielHead1.alpha = 1.0;
}

function DanielMouseOutHandler(e:MouseEvent):void {
DanielHead1.alpha = 1.0;
DaveHead1.alpha = 1.0;
}

} // end of AboutHeadRollOver function.
} // end of frame number 166 function