jQuery slideToggle a table div

jQuery slideToggle a table div

Ref my included html, how do I using jQuery slideToggle the div tag according to the row button clicked?

My code just show/hides all divs, I need to do this only for the selected one.

Thanks.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title></title>
  <style type="text/css">
    .btnTog
    {
      cursor: hand;
    }
    .divAdd
    {
        font-weight:bold;
        color: Blue;
    }
  </style>

  <script type="text/javascript" src="script/jquery-1.4.2.js"></script>

  <script type="text/javascript">

    $(document).ready(function() {

      $(".btnTog").click(function() {

        $(".divAdd").slideToggle('slow');

      });

    });

  </script>

</head>
<body style="font-size: 11px">
  <table border="1" cellpadding="2" cellspacing="2">
    <thead>
      <tr>
        <th>
        </th>
        <th>
          Column 2
        </th>
        <th>
          Column 3
        </th>
        <th>
          Column 4
        </th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td valign="top">
          <button class="btnTog">
            X
          </button>
        </td>
        <td>
          Mr Harry Smith
          <div class="divAdd">
            <br />
            10 Bath Road<br />
            Old Town<br />
            Swindon<br />
            SN1 2EN
          </div>
        </td>
        <td valign="top">
          XXXXXXXXXXXXXXX
        </td>
        <td valign="top">
          YYYYYYYYYYYYYYY
        </td>
      </tr>
      <tr>
        <td valign="top">
          <button class="btnTog">
            X
          </button>
        </td>
        <td>
          Mr Fred Smith
          <div class="divAdd">
            <br />
            10 Bath Road<br />
            Old Town<br />
            Swindon<br />
            SN1 2EN
          </div>
        </td>
        <td valign="top">
          XXXXXXXXXXXXXXX
        </td>
        <td valign="top">
          YYYYYYYYYYYYYYY
        </td>
      </tr>
      <tr>
        <td valign="top">
          <button class="btnTog">
            X
          </button>
        </td>
        <td>
          Mr Fortisgue Smith
          <div class="divAdd">
            <br />
            10 Bath Road<br />
            Old Town<br />
            Swindon<br />
            SN1 2EN
          </div>
        </td>
        <td valign="top">
          XXXXXXXXXXXXXXX
        </td>
        <td valign="top">
          YYYYYYYYYYYYYYY
        </td>
      </tr>
    </tbody>
  </table>
</body>
</html>