Help with a browser specific error

Help with a browser specific error

Hi,
I hope this is the right place to ask for help. I have a problem that ONLY comes up in FireFox.

When you click on Current Projects, it scrolls down to the thumbnails. When you click on a thumbnail, it opens up like a google image, click again it closes. It works fine in all browsers except Firefox, where when you click on the thumbnail, the page jumps up. I can't figure it out, I hope I can get some help.

When I go to the site for the first time, it seems to be fine, when I go to another page (try Contact) then back to index, it doesn't work. When I preview the local files on my computer, it is fine, only when it is uploaded to the web.

I hope that's enough info. I am getting an error ReferenceError: WSCore is not defined

http://paulfishman.ca/test

Thanks,
Paul