// Find the previous image and show it
  function prevImage() {
      // Locate the previous gallery image and show it
      showImage( prev( curImage ) );
                  
      // Prevent the link from operating as normal
      return false;
  }
  
  // Find the next image and show it
  function nextImage() {
      // Locate the next gallery image and show it
      showImage( next( curImage ) );
                  
      // Prevent the link from operating as normal
       return false;
  }