AS2 adjustment

Question

I am using this code within a AS2 project:
for(var i:uint = 1; i<=3; i++){ 
     this["btn"+String(i)].addEventListener(MouseEvent.ROLL_OVER, bringToFront);
function bringToFront(evt:MouseEvent):void {
     this.setChildIndex(SimpleButton(evt.currentTarget), this.numChildren-1);
This was originally from a AS3 project. I have tried to change the syntax but i can't seem to figure out what to change it to.
I am getting compiler errors that say:
The class or interface 'uint' could not be loaded
The class or interface 'MouseEvent' could not be loaded.
How can i fix this?

Answer 1

for(var i:Number = 1; i<=3; i++){ 
     this["btn"+String(i)].onRollOut = bringToFront;
function bringToFront():Void{
    this.swapDepths(this._parent.getNextHighestDepth());