everyone i am developing bubble shooter game in cocos2d I have placed shooter array which contain different color bubbles like this

00000000

it is 8 bubbles array if i tap the screen, first bubbles should move for shooting the target .png .And if i again tap the screen again 2nd position bubble should move for shooting the target.png bubbles,how it will possible for me because i have already created the array of target which contain different color bubbles, here i write the code :

- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    // Choose one of the touches to work with
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];

    // Set up initial location of projectile
    CGSize winSize = [[CCDirector sharedDirector] winSize];

        NSMutableArray * movableSprites  = [[NSMutableArray alloc] init];
    NSArray *images = [NSArray arrayWithObjects:@"1.png", @"2.png", @"3.png", @"4.png",@"5.png",@"6.png",@"7.png", @"8.png",  nil];       
    for(int i = 0; i < images.count; ++i) {

            int index = (arc4random() % 8)+1;
            NSString *image = [NSString stringWithFormat:@"%d.png", index];

        CCSprite*projectile = [CCSprite spriteWithFile:image];
    //CCSprite *projectile = [CCSprite spriteWithFile:@"3.png" rect:CGRectMake(0, 0,256,256)];
        [self addChild:projectile];


        [movableSprites addObject:projectile];

        float offsetFraction = ((float)(i+1))/(images.count+1);
        //projectile.position = ccp(20, winSize.height/2);  
        //projectile.position = ccp(18,0 );
        //projectile.position = ccp(350*offsetFraction, 20.0f);
        projectile.position = ccp(10/offsetFraction, 20.0f);

    // projectile.position = ccp(projectile.position.x,projectile.position.y);
    // Determine offset of location to projectile
    int offX = location.x - projectile.position.x;
    int offY = location.y - projectile.position.y;

    // Bail out if we are shooting down or backwards
    if (offX <= 0) return;

    // Ok to add now - we've double checked position
    //[self addChild:projectile];

    // Determine where we wish to shoot the projectile to
    int realX = winSize.width + (projectile.contentSize.width/2);
    float ratio = (float) offY / (float) offX;
    int realY = (realX * ratio) + projectile.position.y;
    CGPoint realDest = ccp(realX, realY);

    // Determine the length of how far we're shooting
    int offRealX = realX - projectile.position.x;
    int offRealY = realY - projectile.position.y;
    float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY));
    float velocity = 480/1; // 480pixels/1sec
    float realMoveDuration = length/velocity;

    // Move projectile to actual endpoint
    [projectile runAction:[CCSequence actions:
                           [CCMoveTo actionWithDuration:realMoveDuration position:realDest],
                           [CCCallFuncN actionWithTarget:self selector:@selector(spriteMoveFinished:)],
                           nil]];

    // Add to projectiles array
    projectile.tag = 1;
    [_projectiles addObject:projectile];
    }
    }