//START:wholefile        

  //START:image_array        
  var images = [["images/cookies.jpg", "Cookies"],
                ["images/pizza.jpg", "Pizza"],
                ["images/grapes.jpg", "Grapes"]
                ];
  //END:image_array        
  //START:random_number                    
  var randomnumber = Math.floor(Math.random()*(images.length)) 
  //END:random_number        

  //START:assignment                    
  var banner = $("banner_image");
  banner.src = images[randomnumber][0];
  banner.alt = images[randomnumber][1];

  //END:assignment  
  
  //START:randomimagefunction        
                    
//END:wholefile