phpeveryday.com

Change <td> for header become <th>.

<table>
  <tr>
    <th>Title</th>
    <th>Singer</th>    
  </tr>
  <tr>
    <td>Yesterday</td>
    <td>Beatles</td>    
  </tr>  
  <tr>
    <td>Kiss Me Quick</td>
    <td>Elvis</td>    
  </tr>  
  <tr>
    <td>Ben</td>
    <td>Michael Jackson</td>    
  </tr>  
  <tr>
    <td>Hei, Jude!</td>
    <td>Beatles</td>    
  </tr>  
</table>

Next, add class for table header at css, like this:

.table-header{
  background-color:#FFFF00;
  font-weight:bold;
}

Last, modify js become like this:

$(document).ready(function(){
  $('th').parent().addClass('table-header');
  $('tr:not([th]):odd').addClass('odd');	
  $('tr:not([th]):even').addClass('even');
  
  $('td:contains("Jude")').addClass('top40');
});