onClipEvent (load) {
	this._x = random(550);
	//sets the horizontal position randomly
	this._y = random(-400);
	//sets the y position above the stage 
	speed = random(5)+1;
	//sets the speed randomly 
}
onClipEvent (enterFrame) {
	this._y += speed;
	//moves the enemy downwards
	if (this.hitTest(_root.head)) {
		//if the enemy hits the player
		_root.gotoAndStop(2);
		//goto the second frame, which will be a gameover screen 
	}
	if (this._y>=310) {
		//if the player reaches 10 pixels below the stage 
		this._x = random(550);
		//randomly set the x, y and speed again. 
		this._y = random(-400);
		speed = random(5)+1;
	}
}