Drupal 6.x Drop-down menu

For the second time, I was tasked with setting-up a down-down menu in Drupal for the Primary Links. I don’t recall struggling last time, but this time it took a while until I could get it to render properly. I checked the old code, and the menu was shown using the Primary Links block. Instead of adding in blocks and doing it the same way, I thought I could make a few small adjustments to the theme’s template.php