title: Google Analytics Code Returns 'Undefined Function" Error
body: <p>whatever I do, I keep getting an "Uncaught TypeError: undefined is not a function" error for the click tracking Google Analytics code.</p>
  
  <p>The page is: <a href="http://www.purevisionmethod.com/eye-exercises/" rel="nofollow">http://www.purevisionmethod.com/eye-exercises/</a></p>
  
  <p>Please, why is this happening...?</p>
  
  <pre><code>&lt;script&gt;
  $('#clicked-headerbar').on('click', function() {
    ga('send', 'event', 'website-banner', 'clicked-ad', 'headerbar', '0');
  });
  $('#clicked-cta-bottom').click( function() {
    ga('send', 'event', 'website-banner', 'clicked-ad', 'cta-bottom', '0');
  });
  $('#clicked-sidebar-image-ad-1').click( function() {
    ga('send', 'event', 'website-banner', 'clicked-ad', 'sidebar-ad-1', '0');
  });
  $('#clicked-sidebar-image-ad-2').click( function() {
    ga('send', 'event', 'website-banner', 'clicked-ad', 'sidebar-ad-2', '0');
  });
  $('#clicked-sidebar-image-ad-3').click( function() {
    ga('send', 'event', 'website-banner', 'clicked-ad', 'sidebar-ad-3', '0');
  });
  &lt;/script&gt;
  </code></pre>
  
  <p>Thanks for your help!!</p>