outlogged user can only see thumbnails?!!

[Fluegel]

Hi!
Is there anything that i can do so the users which are not registred/logged in can't full-view the images? (only see the thumbnails)
This would be a great feature ...
Fluegel

[Nibbler]

FAQ: How can I let unregistered users see the thumbnails only, but not the actual pictures?.

[Fluegel]

I'm sorry! I actually didn't look there ...
Thank you so much!