<input type="radio" id="panel-1" name="panels" checked>
<input type="radio" id="panel-2" name="panels">
<input type="radio" id="panel-3" name="panels">

<ol class="tabs">
  <li><label for="panel-1">One</label></li>
  <li><label for="panel-2">Two</label></li>
  <li><label for="panel-3">Three</label></li>
</ol>

<div class="panel-1">Panel one contents.</div>
<div class="panel-2">Panel two contents.</div>
<div class="panel-3">Panel three contents.</div>