How can I add a skip button above the webform (with multistep)

Hi everybody !

I use webform with multistep for a quiz. I want to add a "skip" button (equivalent to the submit/next button in the bottom of the form) above the form so that people can go directly to the next question without having to scroll down the page like that :

Skip this question
My form
< Previous | Next > 

I succeeded to add an another submit button (check code below). But when I click on this button it returns to the previous step instead of going to the next step ... I don't understand why .. And I can not put it above the form.

function mytemplate_form_alter(&$form, &$form_state, $form_id) {
  switch ($form_id) {
  case 'webform_client_form_13':
    $form['submit'] = array(
      '#type' => 'submit',
      '#value' => t('skip'),
    );
    break;
  }
}

Have you got an idea for help me ?

Thanks you for advance

PS : sorry for my bad english