replace text

HTML

<table>
    <tr>
        <td>First Name</td>
        <td>none</td>
    </tr>
</table>

JavaScript

$('table tr td:contains("First Name")').each(function() {
    var text = $(this).text();
    $(this).text(text.replace('First Name', 'Gattitown or Gatti\'s Pizza ')); 
});