Change width & height

programming flash
1

I’ve got a mc which I’ve put this code onto:


onClipEvent(enterFrame) {
	var acceleration = 0.8;
	nuw = this._width;
	nuh = this._height;
	if (this._width < 50 && this._height < 80) {
		nuw = this._width;
		nuh = this._height;
		
		this._width = nuw + (3 * acceleration);
		this._height = nuh + (4 * acceleration);
		}
	}

This makes the mc bigger. How should I do to make it shrink back to normal size again??