please review your template or other plugin.
SlidesJS is loading again an old version of the jquery library, after loading fancybox and the out of the box version of jquery of wordpress. Please update or remove the second jquery call of SlidesJS and it's working. (Have a look at the website source header, then you'll know what I mean :))
<!-- SlidesJS Required: Link to jQuery -->
<!-- End SlidesJS Required -->
This is not a problem of this plugin.
If you've got further questions, don't hesitate to ask :)