If your thumbnails aren't displaying either the image path is wrong, as before, or you haven't loaded the images onto your server.
At the moment there's a console error generated when the image is clicked. The error referenced suggests there's a problem generated by the slideshow script. You don't have Fancybox loaded on your page that I can see. You do have prettyPhoto loaded, however I can't see anything that's setting it up (may just have missed it). If it is being set up correctly, it's possible that your version of prettyPhoto needs updating to a later version. I don't know prettyPhoto, but it looks as if the version you're using is quite out of date.