Hi Alex,
I have it nearly running, but I have the following problem:

When I load up a picture via the categories.php bzw. product.php it gets chmod 777 and it works in all contributions (like lightbox and "What is new Scoller"). If I load up pictures with Imagehandler 2, they get chmod 650 and the contrbutions above didn't work until I change the chmod with ftp-program.
That couldn't be. Please help me, how can I solve this problem.

Michael