Topic: Help! Ugly mesh effect on pictures

I do have a very special problem ...
Some of my gallery pictures show up with an ugly mesh effect ...
This effect appears mostly on black and white photos ...

Here's the link to my gallery - open the folder "Denmark 2008" ...
take a closer look at the black and white pics ... but the effect also
appears on colour photos ...

mindcage-fotodesign.de / Galerie / Diverses / Folder: Denmark 2008

Please help !!!

Regards,
Mindcage