Well, the image is already in the publication. Well I actually solved this in a Smarty template for the block.
Using
to get hold of the tid and pid and then
to load the right publication. The only not-good part of this solution is that I hook this template on the Pagesetter publication block, thus loading two publications from the database. In an optimal world I would only load the one with the right image. I tried to add my own bloc in pagesetter/pnblocks, but it did not show up in the "create block" menu in admin.
Well, it works so optimizations will have to come later
Regards
Tor