Note that the js and css is not minified so it is readable. See tabs-example.js for the tab creation code and tabs-example.css for the css.
var tabs = new YAHOO.ext.TabPanel('tabs1'); tabs.addTab('script', "View Script"); tabs.addTab('markup', "View Markup"); tabs.activate('script');
<div id="tabs1"> <div id="script" class="tab-content"> (Content goes here) </div> <div id="markup" class="tab-content"> (Content goes here) </div> </div>