How to track clicks on a banner

I would like to track the number of clicks on a banner leading to an external website. I implemented the code given on my Analytics page but it does not work. Here is the code for the banner:

onClick="_gaq.push(['_trackEvent', 'External', 'Click', 'Banner']);" href="MyExternalLink" title="MyText" target="_blank"><img class="imageBorder" src="images/image.jpg" alt="MyAltText" width="468" height="60" /></a>

Code (markup):

I copied he code in the head section:

<script type="text/javascript">
      var _gaq = _gaq || [];
      _gaq.push(['_setAccount', 'UA-1234567-1']);
      _gaq.push(['_trackPageview']);
 
      (function() {
        var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
        ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
      })();
    </script>

Code (markup):

On my Analytics page, in the Content, Events section, nothing appears, even after 24h. What's wrong?

Thank you for your time.
Cheers

 

Please disregard my post, I've found the problem. My code is right, it was my mistake. Sorry.