title: jQuery.closest() gives "null" value
body: <p>I am doing with this <a href="http://jquery.bassistance.de/tooltip/demo/" rel="nofollow">plugin</a> : </p>
  
  <pre><code>&lt;table&gt;
  &lt;tr&gt;
       &lt;td&gt;
       &lt;a class="linkType1" href="google.com"&gt;
           Google
       &lt;/a&gt;
       &lt;span style="display: none;"&gt;Goooooooooooogle&lt;/span&gt;
      &lt;/td&gt;
  &lt;/tr&gt;
  
  &lt;tr&gt;
      &lt;td&gt;
      &lt;a class="linkType1" href="yahoo.com"&gt;
          Yahoo
      &lt;/a&gt;
      &lt;span style="display: none;"&gt;Yaaaaaaaaaaaaaaho&lt;/span&gt;
      &lt;/td&gt;
  &lt;/tr&gt;
  &lt;/table&gt;
  </code></pre>
  
  <p>How can I select the <code>closest</code> <code>span</code> of <code>linkType1</code>-anchors for displaying as tooltip ?</p>
  
  <p>Currently I am doing :</p>
  
  <pre><code>jQuery(document).ready( function() {
      jQuery("a.linkType1").tooltip({ 
          bodyHandler: function() { 
              alert(jQuery(this).closest("span").html()); // this alert is showing `null`
              return "hi"; // i need to setup the alerted content here
          }, 
          showURL: false 
      });
  });
  </code></pre>