SO - 16913988

by Arun P Johny

HTML

<h2 class="x1">1</h2>
<h2 class="x2">2</h2>
<h2 class="x3">3</h2>
<h2 class="x4">4</h2>
<h2 class="x5">5</h2>

JavaScript

var pos = $('.x4').index();
$('.x4').insertBefore('.x2');
$('.x2').insertBefore($('h2').eq(pos));