template.php

<?php

function phptemplate_pager_link($text, $page_new, $element, $parameters = array(), $attributes = array()) {
  if ($text === t('next ›')) {
    $attributes['rel'] = 'next';
  } else if ($text === t('‹ previous')) {
    $attributes['rel'] = 'prev';
  }
  return theme_pager_link($text, $page_new, $element, $parameters, $attributes);
}