As far as I know drupal only passes the node object to node-tpl. You will have to process other non-related variables before trying to use them in your tpl file.
mhm - i thought so already, but wasnt't sure. so if i see this right, i have to preprocess the variables in the template.php in order to make new variables available for the node script?
i am doing this for the first time and have hardly any experience in php - so i am really puzzled about making new variables available thru template.php. any help would be appreciated or a link to a good manual? (or do i have to learn php from scratch ;) i've checked out quite some manuals but i don't really understand the processing.... thx b#