title: Add a shake effect on a div when inputs are not valid
body: <p>I am trying to make this divs shakes when the inputs are not valids (or they don't have been filled): <a href="http://jsfiddle.net/jalxob/ahQLC/13/" rel="nofollow">http://jsfiddle.net/jalxob/ahQLC/13/</a></p>
  
  <p>I tried to do it by myself using:</p>
  
  <pre><code>    .effect('shake');
  </code></pre>
  
  <p>Can someone please help me?</p>
  
  <p>Thank you!</p>