Hmmm i just checked your dev-page and i still see the old head section so i cant see what could be the problem with fancybox. Is the frontend.class.php changed and the plugin activated?
Edit: I see the plugin was updated by @mvlcek so u should update your plugin and after we see whats with the fancybox thing.
Edit: I see the plugin was updated by @mvlcek so u should update your plugin and after we see whats with the fancybox thing.