title: Preload next image in Fancybox2 gallery
body: <p>I would like to preload the next image in a Fancybox2  gallery, but I don't know if that's possible. I know how to preload and image by creating a new Image() object and setting the src attribute, but I don't know which Fancybox callback should I use.
  Does anyone know which Fancybox event is triggered when it starts or it finishes displaying the current image?</p>
  
  <p>So the answer is: simply use 2.0.5 and above to take advantage of the <code>preload</code> setting, which preloads 3 images by default.</p>