random button var not working with switch statement

I've got a random button on the stage fading in. I'm trying to test which button is fading in because I have different URL's depending on which button it is. Below is the code I am using, which doesn't generate any errors...just doesn't work. I'm able to trace the correct button, but my switch statements aren't working. I'm not sure if it's a syntax thing or another problem. Thanks!!

var currentImage:MovieClip;

var arrGrowing:Array = new Array(resume_mc, magazine_mc,suitcase_mc, monopoly_mc, superhero_mc, hat_mc,

chair_mc, books_mc, lightbulb_mc);

for(var i=0;i<arrGrowing.length;i++){

arrGrowing.alpha = 0;

arrGrowing.buttonMode=true;

arrGrowing.addEventListener(MouseEvent.CLICK, onButtonClick);

}

function initLoop():void {

currentImage = arrGrowing[Math.floor(Math.random()*arrGrowing.length)];

var exitTween:Tween=new Tween(currentImage,"alpha",Regular.easeOut,0,1,12,false);

}