title: how to add and remove a class in jquery every 4 seconds
body: <p>for some reason, this isn't adding and removing a new class on elements with the class of post, every 4 seconds. jquery loads correctly, as does this. chrome shows no errors with the code.</p>
  
  <pre><code>$(document).ready(function(){
      $('.post').addClass('display').delay(4000).removeClass('display');
  });
  </code></pre>