The link for pornovision on the pet post'n'pals site reads:
http://www.midnitecrowproductions.com/pornovision/
which redirects to "you have reached a dead end - go back the way you came"
The link for pornovision on the petlovers forum site reads:
http://www.midnitecrowproductions.com/PornOVision/
and works fine.
I'm using Opera V9.52, and the missing capital letters in the address seems to make the difference. I have not tried with other browsers.
I think if you change the link name on pet post'n'pals site to use capitals, it should work ok.