Twitter's [Bootstrap][1] framework uses `Tabs` and `Tab content`:

    <ul class="tabs">
      ...
    </ul>
    <div class="tab-content">
      ...
    </div>

Something similar is used in the [jQuery UI Tabs][2].


  [1]: http://twitter.github.com/bootstrap/javascript.html#tabs
  [2]: http://jqueryui.com/demos/tabs/