// ActionScript 2.0クラス定義ファイル: Ball.as
class Ball extends MovieClip {
	var speed:Number = 0;
	var accel:Number = 1;
	var boundPos:Number = 200;
	function onEnterFrame() {
		this._y += speed;
		if (this._y>=boundPos) {
			speed *= -1;
		} else {
			speed += accel;
		}
	}
}