STUCK WITH TABLE EXPANDABLE

STUCK WITH TABLE EXPANDABLE

Hello,

I am very new at jquerry and I am trying to make things work, but it doesn't. I took an example of expandable tables at http://www.packtpub.com/article/jquery-table-manipulation-part2
and I am trying to use the following code:

$(document).ready(function() {

  var toggleMinus = '../icons/minus.png';

  var togglePlus = '../icons/plus.png';

  var $subHead = $('tbody th:first-child');

  $subHead.prepend('<img src="' + toggleMinus + '"
                                    alt="collapse this section" />');

  $('img', $subHead).addClass('clickable')

  .click(function() {

    var toggleSrc = $(this).attr('src');

    if ( toggleSrc == toggleMinus ) {

      $(this).attr('src', togglePlus)

      .parents('tr').siblings().fadeOut('fast');

    } else{

      $(this).attr('src', toggleMinus)

      .parents('tr').siblings().fadeIn('fast');

    };

  });


And hereafter my test file:





<html>
<head>
<link rel="stylesheet" media="screen" type="text/css" href="css_table.css" />
<script src="jquery-1.2.6.min.js" type="text/javascript"></script>
<script src="expand.js" type="text/javascript"></script>


</head>
<body>
<div id="content">

<table class="striped">

  <thead>

    <tr>

      <th>Date</th>

      <th>Headline</th>

      <th>Author</th>

      <th class="filter-column">Topic</th>

    </tr>

  </thead>

  <tbody>

    <tr>

      <th colspan="4">2007</th>

    </tr>

    <tr>

      <td>Mar 11</td>

      <td>SXSWi jQuery Meetup</td>

      <td>John Resig</td>

      <td>conference</td>

    </tr>

    <tr>

      <td>Feb 28</td>

      <td>jQuery 1.1.2</td>

      <td>John Resig</td>

      <td>release</td>

    </tr>

  </tbody>

  <tbody>

    <tr>

      <th colspan="4">2006</th>

    </tr>

    <tr>

      <td>Dec 27</td>

      <td>The Path to 1.1</td>

      <td>John Resig</td>

      <td>source</td>

    </tr>

  </tbody>

</table>
</div>
</body>
</html>



I imported both jquery library and expand.js, what else shall I do for it to work??
Thanks