Setup

Download the code.
Stereotabs requires prototype.js and effects.js (part of the scriptaculous library). If you don't want the fade-in / fade-out effect, you can do without effects.js

Include the source files.

<script type="text/javascript" src="js/prototype.js"></script>
<script type="text/javascript" src="js/effects.js"></script>
<script type="text/javascript" src="js/stereotabs.js"></script>

Initialize the tabs.

<script type="text/javascript">
//<![CDATA[
Event.observe(window, 'load', loadTabs, false);
function loadTabs() {
  var tabs = new tabset('container'); // name of div to crawl for tabs and panels
  tabs.autoActivate($('tab_first')); // name of tab to auto-select if none exists in the url
}
//]]>
</script>