t>PREVBOTTOM</tt>
	</td>
	<td valign="top">
        Previous items bottom co-ordinate. 
        </td>
      </tr>
      <tr>
	<td valign="top">
	<tt>PREVWIDTH</tt>
	</td>
	<td valign="top">
        Previous items width. 
        </td>
      </tr>
      <tr>
	<td valign="top">
	<tt>PREVHEIGHT</tt>
	</td>
	<td valign="top">
        Previous items height. 
        </td>
      </tr>
      </tbody></table>
    </ul>
    example: <tt>PREVRIGHT+2</tt> <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    &nbsp;&