Space Invader movement question

1

I’m trying to create a Space Invaders clone to learn more about game programming in Flash, and I’m kind of stuck on how to get them to move.

I have three different sprites, then 3 for loops duplicate them to make rows. Then, I want to make all the sprites move back and forth in unison, moving down a row every once in a while.

My prototype makes the sprites move left and right, checks for a collision with a wall, and if there is, reverse the direction and increment a variable. When that variable reaches say, 2, it shifts the Y position up a bit (moving the sprite(s) down).

But, the prototype is making each sprite move independantly, how can I make them ALL move in unison?

MovieClip.prototype.move = function() {
 	this.speed = 1;
 	
 	this.left = 5 + this._width/2;
 	this.right = 200 - this._width/2;
 	
 	this.onEnterFrame = function() {
 		this._x += this.speed;
 		
 		if(this._x < this.left) {
 			this.speed *= -1;
 			bounces++;
 		}
 		if(this._x > this.right) {
 			this.speed *= -1;
 			bounces++;
 		}
 		
 		if(bounces == 2) {
 			this._y += 5;
 			bounces = 0;
 		}
 	}
 }
 
 for(i=1; i<9; i++) {
 	_root["sprite3"+i].move();
 }

Any help appreciated.

2

Uhm…bump