- (void)addImageButton:(NSString*)normalImage 
           selected:(NSString*)selectedImage 
           position:(CGPoint)position 
           target:(id)target
           selector:(SEL)sel 
              z:(int)z
            tag:(int)tag
{
  CCSprite *normalSprite = [CCSprite spriteWithFile:normalImage];
  CCSprite *selectSprite = [CCSprite spriteWithFile:selectedImage];
  
  normalSprite.anchorPoint = ccp(0,0);
  selectSprite.anchorPoint = ccp(0,0);
  
  assert(normalSprite);
  assert(selectSprite);
  
  CCMenuItem *menuItem = [CCMenuItemSprite itemFromNormalSprite:normalSprite
                           selectedSprite:selectSprite
                               target:target
                             selector:sel];
  
  CCMenu *menu = [CCMenu menuWithItems:menuItem, nil];
  menu.position = position;
  
  [target addChild:menu z:z tag:tag];  
}