The case of the missing pics

I did this site for this friend of mine and he’s telling me that on the gallery page, he can’t see any of the links to picture. He says he clicks on them and nothing happens. I’d appreciate it if someone would go to the site and see if they have the same problem?
Thank You,

P.S. if you do have the same problem, what do you think could cause some poeple to see it and not others?