Topic: Postcard viewer not showing up on firefox

Hello to all!
I've been having some problems with firefox and postcard viewer.
Firefox doesn't load anything. It looks like it's moving data around but other than that nothing happens. The same goes for some versions of explorer.
Here is my site
w w w .marvelousdecay. c o m

If you could check it out and give me a suggestion or two that would be great

Thanks in advance