Second drop down list based on first drop down list

[juslai]

<table width="200" border="1" class="form_table">
            <tr>
                <td>Driver:</td>
                <td><select name="driver" class="driver" id="form_name" >
                  <?php
do {  
?>
                  <option value="<?php echo $row_Driver['id_driver']?>"><?php echo $row_Driver['driver_fullname']?></option>
                  <?php
} while ($row_Driver = mysql_fetch_assoc($Driver));
  $rows = mysql_num_rows($Driver);
  if($rows > 0) {
      mysql_data_seek($Driver, 0);
      $row_Driver = mysql_fetch_assoc($Driver);
  }
?>
                </select></td>
            </tr>
            <tr>
                <td>Waybill:</td>
                <td><select name="select" class="waybill" id="form_name" ></select></td>
            </tr>
        </table>

How can I use jquery or javascript for the second drop down list to show the records related to the first drop down list from my database.

EDIT
Found exactly what i want http://www.sourcecodester.com/tutorials/php/5568/creating-dependent-dropdown-list-php-jquery-and-ajax.html