Customize the Drupal 6 Comment Form

Originally I found this site that said this could be done within the theme, but I ended up going for a hook_form_alter.

// Put this in mymodule.module

 * Implementation of hook_form_alter().
function mymodule_form_alter(&$form, $form_state, $form_id) {
  switch ($form_id) {
    case 'comment_form':
      // Rename some of the form element labels.
      $form['name']['#title'] = t('Name');
      $form['homepage']['#title'] = t('Website (optional)');

      // Add some help text to the homepage field.
      $form['homepage']['#description'] = t('If you have your own website, enter its address here and we will link to it for you. (please include http://).');
      $form['homepage']['#description'] .= '<br/>' . t('eg.');

      // Remove the preview button
       $form['preview'] = NULL;
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