SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<ul id="ImportantNumbers">
   <li id="one">1</li>
   <li id="two">2</li>
   <li id="topNumber">top</li>
   <li id="four">4</li>
</ul>

JavaScript

$("#topNumber").prependTo("#ImportantNumbers");