Access key nav

<?php $i=1; foreach($this->find('/')->children() as $menu): ?><?php $i++; ?>
      <li<?php echo in_array($menu->slug, explode('/', $this->url)) ? ' class="current-tab"': null; ?>><?php echo $menu->link($menu->title.' ['.$i.']', ' accesskey="'.$i.'"'); ?></li>
<?php endforeach; ?>