The script looks at whatever you have entered in the header/footer field. It first
checks to see if what you entered is a file and if it is it will insert the contents
of that file. (from the 2.0 readme.txt)
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1. Can these files be either html or text format?
2. Do you have to supply a "full url" in the category entries or since my script path is already specified in the links.cfg (as $db_script_path . "/header" can I just enter /header.html, in the category field?
3. If you leave any of these field blank while entering a "category" or a "link" in the database, can you enter them at a later time? If so, how?

Thanks