andy mahoney gave me the answer. thanks.
i needed curly braces instead of parentheses. perhaps this is a case where a little documentation would have helped after all, since my eyes obviously could not see the difference
{story_topic_name}this gives a link in the story to the current topic, without icon image files (and it works on IE and Firefox).
and this makes me think that any $article varialbes that are set in the php
files can probably be used in the template.