Ok, that did work... made a symbolic link from /home/public/data/pictures to /home/public/data/other/Windows Share: Fotos/...
After indexing these files, i can select them from the pictures menu...
But how can i make a slideshow out of that, like it ist from the flickr-pictures ? Selecting play all does not do anything... and viewing the pictures on half the screen's size with a couple of buttons for close and delete is not, what i want to do with my pictures... I want to make slideshows for my friends...