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<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
<table>
<tr>
<td colspan="2" id="First">
</td>
<td colspan="2" id="Second">
</td>
</tr>
</table>
  <script>
    (function() {
      var index = 0;
      $("#Second").prevAll("td").each(function() {
        index += this.colSpan;
      });
      display(index);      
      function display(msg) {
        var p = document.createElement('p');
        p.innerHTML = String(msg);
        document.body.appendChild(p);
      }
    })();
  </script>
</body>
</html>
Output

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anonymouspro
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