Tween class for elastic layout

1

how would i bring a tween class that would allow for elastic ease out into this code

Stage.align = “TL”;
Stage.scaleMode = “noScale”;
stageListener = new Object();
stageListener.onResize = function() {
moveIt();
};
Stage.addListener(stageListener);
moveIt = function () {
dash.onEnterFrame = function() {
this._x += ((Stage.width / 2) - this._x) / 5;
this._y += ((Stage.height / 2) - this._y) / 5;
};
};

stageListener.onResize();