<style type="text/css">
div.left { float:left }
div.right { float:right }
div.middle {float:none;margin-left:30%;margin-right:30%}
</style>
<div class="left">
<ul>
  <li>List 1</li><li>List 2</li><li>List 3</li>
</ul>
</div>
<div class="right">
<ul>
  <li>Right List 1</li><li>Right List 2</li><li>Right List 3</li>
</ul>
</div>
<div class="middle">
<ul>
  <li>Middle List 1</li><li>Middle List 2</li><li>Middle List 3</li>
</ul>
</div>
<h3 style="clear:both">Next Title Set to Clear All Three</h3>