With the following code I need to locate all elements with a cell_name that starts with the word Driver.  Once I identify these rows I need to select the data_table element within the same row and change the css class.  Any help with a fast and efficient query.

1. <table>
    <tbody>
     <tr class="row_folder">
      <td class="matrix_cell">
       <div>
        <div class="cell_name">Driver #1</div>
       </div>
      </td>
      <td class="matrix_line">
       <div>
        <table class="data_table folder">
         ...
        </table>
       </div>
      </td>
     </tr>
     ...
    </tbody>
   </table>