title: Error with Uploadifive
body: <p>I'm using the HTML5 version of <a href="/questions/tagged/uploadify" class="post-tag" title="show questions tagged &#39;uploadify&#39;" rel="tag">uploadify</a>, called <a href="/questions/tagged/uploadifive" class="post-tag" title="show questions tagged &#39;uploadifive&#39;" rel="tag">uploadifive</a>.</p>
  
  <p>I'm following the instructions to the letter and I'm getting the following error message:</p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot read property 'addEventListener' of undefined</p>
  </blockquote>
  
  <p>I'm using the latest version of Chrome.</p>
  
  <pre><code>&lt;?php $timestamp = time();?&gt;
      $(function() {
          $('#file_upload').uploadifive({
              'auto'             : false,
              'checkScript'      : 'check-exists.php',
              'formData'         : {
                  'timestamp' : '&lt;?php echo $timestamp;?&gt;',
                  'token'     : '&lt;?php echo md5('unique_salt' . $timestamp);?&gt;'
              },
              'queueID'          : 'queue',
              'uploadScript'     : '&lt;?php echo base_url('/Kb/upload_file'); ?&gt;',
              'onUploadComplete' : function(file, data) { console.log(data); console.log(file); }
          });
      });
  </code></pre>
  
  <p>When I use the non-minified version I track the error message to line 631 of the uploadifive.js script:</p>
  
  <pre><code>$dropTarget.addEventListener('dragleave', function(e) {
      // Stop FireFox from opening the dropped file(s)
      e.preventDefault();
      e.stopPropagation();
  }, false);
  </code></pre>
  
  <p>Any thought?</p>