Webform summary confirmation

Is there a simple way to let webform to show a confirmation page, with a user choices summary, after sending the form?
I know webform can redirect POST arrays, but it registers the submitted form, and i don't want this till user has confirmed his choises.

I'm a new drupal user, so i've found a solution which seems to work but it is probably too rough, maybe buggy, i don't know. Any suggestion, help or comment is appreciated.
Samuele

Put this code in the "Addiotional Validation" field of your form (_my_submission_format create the summary message and is modeled after webform_submission_format webform function):

if ($_POST['to_hidden']=='1' || form_get_errors()) return;
form_set_error('', t('Confirm your submission.'));
t('Riepilogo dati:');
$output .= nl2br(_my_submission_format("", $form_values['submitted_tree'], $node));

$myform=drupal_get_form('tohidden');
$cgtoken=drupal_get_token('tohidden');
$nwtoken=$form_values['form_token'];
$myform = str_replace($cgtoken,$nwtoken,$myform);
$myform = str_replace('tohidden',$form_id,$myform);
$output.=$myform;
print theme('page',$output);
exit;

function _my_submission_format($key, $value, $node, $indent = "") {
    // First check for component-level themes
    $themed_output = theme("webform_mail_". $node->webformcomponents[$key]['type'], $value, $node->webformcomponents[$key]);
    if ($themed_output) {
      // Indent the output and add to message
      $message .= $indent;
      $themed_output = rtrim($themed_output, "\n");
      $message .= str_replace("\n", "\n". $indent, $themed_output);
      $message .= "\n";
    }
    // Generic output for single values
    elseif (!is_array($value)) {
      // Note that newlines cannot be preceeded by spaces to display properly in some clients
      if ($node->webformcomponents[$key]['name']) {
        // if text is more than 60 characters, put it on a new line with space after
        $long = (strlen($indent . $node->webformcomponents[$key]['name'] . $value)) > 60;
        $message .= $indent.$node->webformcomponents[$key]['name'] .":". (empty($value) ? "\n" : ($long ? "\n$value\n\n" : " $value\n"));
      }
    }
    // Else use a generic output for arrays
    else {
      $message .=  $node->webformcomponents[$key]['name'] .":\n";
      foreach ($value as $k => $v) {
        $message .= _my_submission_format($k, $v, $node, $indent ."  ");
      }
    }
    return ($message);
}


function tohidden(){
 global $form_values,$_POST;
 $tform=convertform($form_values);
foreach ($tform as $field_id => $value) {
 $form['submitted'][$field_id]=$value;
}
 $form['submitbutton'] = array(
  '#type' => 'submit',
  '#value' => t('Confirm'),
);
 $form['to_hidden'] = array(
       '#type' => 'hidden',
       '#value' => true
     );
    
 return $form;
}

function convertform ($sform){
 foreach ($sform as $field_id => $value) {
   if (is_array($value)) {
     $cform[$field_id] = array(
       '#tree' => TRUE
     ); 
     $sform2=convertform($value);
     foreach ($sform2 as $field_id2 => $value2) {
      $cform[$field_id][$field_id2]=$value2;
     }
   } else {
     $cform[$field_id] = array(
       '#type' => 'hidden',
       '#value' => $value
     );
   }
 }
return $cform;
}