public Menu(Cong cong){
        this.cong = cong;
        // load the menu spritesheet
        try{
            ss_image = loader.loadImage("/sprite_sheet_menu.png");
            ss = new SpriteSheet(ss_image);
        }
        catch(IOException e){
	}
        
        // build the menu for the current state
        rebuildMenu();
    }