title: $("a[rel=popover]").popover is not a function
body: <p>I call the <code>js</code> files for <code>bootstrap twitter</code> library but I get the error that indicates</p>
  
  <pre><code>$("a[rel=popover]").popover is not a function
  </code></pre>
  
  <p>.</p>
  
  <pre><code>&lt;script src="../../jq/jquery-1.7.1.min.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;script src="../../bootstrap/js/bootstrap.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;script src="../../bootstrap/js/bootstrap-tooltip.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;script src="../../bootstrap/js/bootstrap-popover.js" type="text/javascript"&gt;&lt;/script&gt;
  
  &lt;script type="text/javascript"&gt;
      $(document).ready(function () {
  
          // second supervisor popover
          $('a[rel=popover]').popover({
              placement: 'below',
              offset: 20,
              trigger: 'manual'
          });
      });
  
  
  &lt;/script&gt;
  </code></pre>