Port to drupal 6.0

I ran the coder (code review) module and it led me through some changes.

The remaining issues are:

Line 134: The menu system has been completely over-hauled in 6.x. (Drupal Docs http://drupal.org/node/102338)
  if ($may_cache) {

severity: critical Line 135: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
    $items[] = array(

severity: critical Line 147: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
      $items[] = array(

severity: critical Line 159: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
      $items[] = array(

severity: critical Line 168: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
      $items[] = array(

severity: critical Line 176: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
      $items[] = array(

severity: critical Line 186: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
    $items[] = array(

severity: critical Line 193: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
  $items[] = array(