[SOLVED] Problem with gallery in Firefox...

Hi,

I have a problem with gallery on my page. I use template 9.When I open my webside on page where there is my gallery and when I open some photo on full screen, then I can't change photos back or forward. If I want change photo, I have to back to small window, and only then I can change it. It happen only when I use Firefox. What's the problem. Is it possible fix it?
Please, help me.
(My website is: www.radoslawpolanski.pl)

Radek