Is there a way to get your category headers and footers onto your detailed pages?

I have custom footers for each category and I'd love to have them show up on the detailed pages to give a more uniform look, but I can't seem to figure out how to get them in there. The $header variable works fine on a category page, but not on a detailed page. I'm not using templates and I'm wondering if there is a snippet of code I can insert into site_html.pl that will make the script open up the category file, get the header, and stick it into the detailed pages that are under that category.

Any suggestions would be appreciated.

Thanks,
TigerLily :)