I would like to know how can I modify the nph-build.cgi and (or) site_html_templates.pl to display in staggered categories the following (with 20 links on each page):

Displaying: 1-20 links
Displaying: 21-40 links
Displaying: 41-43 links (this is the last page with only 3 links)

I have installed the similar mod for search results page where everithyng works well.

Thanks in advance!