How to use a listen function from a movieclip

[FlashmanSK]

Hello, thanks for your help. This is my code so far, but there seems to be some problems. I'm sure I probably modified the code incorrectly, could you please help me out?

var buttons:Array = [box1, box2, box3];
var current:MovieClip = null;

for (var i:int = 0; i < buttons.length; i++){
  buttons[i].addEventListener(MouseEvent.MOUSE_DOWN, buttonPress);
}

function buttonPress(e:MouseEvent):void{
  if (current != null){
     current.gotoAndPlay("out2");
  }
  current = MovieClip(e.currentTarget);
  current.gotoAndPlay("over2");
}