rel="" external /AJAX content fetch not working?

As per http://plugins.learningjquery.com/cluetip/ i see that if i specify

  <!-- use ajax/ahah to pull content from fragment.html: -->
  <p><a class="tips" href="fragment.html" rel="fragment.html">show me the cluetip!</a></p> 

It should fetch the fragment.html , but when i mouse over in drupal i don't see the cluetip nor do i see the request in my apache logs for the fragment.html

I was hoping to connect this to the component module to get some data from drupal (mainly because i'de like to display images etc in the cluetip)

any ideas?