I have a question regarding the integration of FancyBox. I would create a gallery with 10 pictures but only one thumbnail. For example: http://fancyapps.com/fancybox/demo/ T
You need a link to all the images in your gallery regardless they show a thumbnail or not so you may have this html
etc. ... in that way, only a single thumbnail is shown and the rest of the links are not visible but functional.
Then a script like this will fire the gallery
$("a.fancybox").fancybox();