track divs use IDs instead of classes

currently, the generated code for the trackback-url div looks like this:

<div id="trackback-url"><div class="box"><div class="box-inner">
      <h2 class="title">Trackback URL for this post:</h2>
      <div class="content">http://sensemaya.org/trackback/118  </div>
</div></div> <!-- /box-inner, /box -->
</div>

this is not up to xhtml standards - no two elements can have the same ID - which is what will happen if i construct a view of nodes using the views module.