viac krat onchange="this.select.submit()"

........
<select name="chatka"  onchange="this.select.submit()">
<option value="0 €"  <?php echo $_POST['chatka']=='1'?"selected":""; ?> >0</option>
<option value="64 €"  <?php echo $_POST['chatka']=='4'?"selected":""; ?>>4</option>
<option value="80 €"  <?php echo $_POST['chatka']=='5'?"selected":""; ?>>5</option>
<option value="96 €"  <?php echo $_POST['chatka']=='6'?"selected":""; ?>>6</option>
<option value="112 €"  <?php echo $_POST['chatka']=='7'?"selected":""; ?>>7</option>
</select>
</td>
<td style="width: 200px;">Cena: <?php echo $_POST['chatka']; ?></td>
</tr>

<tr>
<td style="width: 376px;">Pristelky</td>
<td style="width: 200px;">
<select name="pristelkych" onchange="this.select.submit()" >
<option value="0 €"  <?php echo $_POST['pristelkych']=='0'?"selected":""; ?> >0</option>
<option value="10 €"  <?php echo $_POST['pristelkych']=='1'?"selected":""; ?> >1</option>
<option value="20 €"  <?php echo $_POST['pristelkych']=='2'?"selected":""; ?> >2</option>
<option value="30 €"  <?php echo $_POST['pristelkych']=='3'?"selected":""; ?> >3</option>
<option value="40 €"  <?php echo $_POST['pristelkych']=='4'?"selected":""; ?> >4</option>
<option value="50 €"  <?php echo $_POST['pristelkych']=='5'?"selected":""; ?> >5</option>
<option value="60 €"  <?php echo $_POST['pristelkych']=='6'?"selected":""; ?> >6</option>
<option value="70 €"  <?php echo $_POST['pristelkych']=='7'?"selected":""; ?> >7</option>
</select></td>
<td style="width: 200px;">Cena: <?php echo $_POST['pristelkych']; ?></td>
</tr>

</table>
Celkova Suma: <?php echo ($_POST['pristelkych']+$_POST['chatka']); ?> €

</form>

onchange="this.form.submit()"