var balloons:Array = [mcBalloonPink, mcBalloonGreen, mcBalloonRed];
var activeBalloons:Array=[];

function spawnRandomBalloons(te:TimerEvent):void
{
    var theBalloon = new balloons[Math.floor(Math.random() * balloons.length)]();

    theBalloon.x = 450;
    theBalloon.y = Math.floor(Math.random()*(1 + topBoundary - bottomBoundary)) + bottomBoundary;

    var balloonTween:Tween = new Tween(theBalloon, "x", None.easeNone, 450, -450, 3, true);
    balloonTween.addEventListener(TweenEvent.MOTION_FINISH, destroyTweenedObj);

    mcGullGame.addChild(theBalloon);
    activeBalloons.push(theBalloon);
}