Thanks for the feedback. I had forgotten that the function returns an array. It will take a bit more code. Use this:
PHP Code:
        $link_name_display cat_name_display(CATEGORIES_BOX_HEADING_SPECIALS,'specials');
        
$content .= '  <li><a class="category-links' $link_name_display[0] . '" href="' zen_href_link(FILENAME_SPECIALS) . '">' $link_name_display[1] . '</a>' '</li>' "\n"
adjusted for each link.

This will replace foreground images, but not background/hover images. That would take a bunch more coding to arrange, much of it new code since $cPath is not involved at all. I will look at this later for inclusion in v2.8.