title: Looping a jQuery font-size animation
body: <p>I currently have a line of text that has a default font-size of 24.
  I animate this to resize back to 22:</p>
  
  <pre><code>$(document).ready(function animateHeader() {
  $('#random_header').animate({fontSize : "22px"}, 500);
  });
  </code></pre>
  
  <p>I want to loop this animation contineously back and forth from 24 to 22 and 22 to 24.
  How can I do this?</p>