Link from Gallery Block [1] (module: gallery) makes mess on my site, please help. I think it's a newbie problem.

Installed everything in correct way, includin URL rewrite plugin and put the gallery block into the site.

Looks fine:
http://free.nesmrtelni.sk/issues/error01.jpg

after clicking one of the thumbnails on the right sidebar, something wrong happen:
http://free.nesmrtelni.sk/issues/error02.jpg

I apprecitate any advise in this issue. Many thanks,
Martin