class Ball {
	public static var gravity:Number = 9.8;
	private static var ballno:Number = 0;
	function Ball() {
		ballno++;
	}
	public function get _g():Number {
		return gravity;
	}
	public function set _g(n:Number):Void {
		gravity = n;
	}
}

/*	IDE code
myBall1 =new Ball(); 
myBall2 = new Ball();
trace(myBall1.gravity); //undefined
myBall2._g = 12;
trace(myBall1._g);		//12
trace(myBall2._g);		//12
*/