sto impazzendo, sembra impossibile che non vada

codice:
<form name="form" method="get" action="vai.asp" id="form">
                    <tr valign="top"> 
                        <td width="31%" align="right">Divisione</td>
                        <td width="69%">
						<select name="div"  id="div" onchange="form.submit();">
                            <option value="C">C</option>
							<option value="D">D</option>
						</select>
                        </td>
                    </tr>
					<tr valign="top"> 
                        <td width="31%" align="right"></td>
                        <td width="69%"> <input type="submit" name="submit" value="Invia..."> </td>
                     </tr>
                  </form>
help pls