How Do I: Retain "Navigation" label AND Show User's Username?

Hello,

I've hacked one line in my Drupal 6 Core User Module so that when a user logs is, the Navigation menu title does not switch to the user's username but rather the menu title "Navigation" is retained, followed by a line that reads "you are logged in as '{username]'.

While it's not too hard to edit this one line after each upgrade, I know it would be better to do it another way. Is there a module that would accomplish this? If not, can someone suggest a simple module that would do it?

Here's what I did as a hack:

Original:

case 1:
        if ($menu = menu_tree()) {
          $block['subject'] = $user->uid ? check_plain($user->name) : t('Navigation');
          $block['content'] = $menu;
        }
        return $block;

Hacked:

case 1:
        if ($menu = menu_tree()) {
         $block['subject'] = $user->uid ? t('Navigation<br><br>You are logged in as<br>"'.($user->name).'"') : t('Navigation');
          $block['content'] = $menu;
        }
        return $block;