//form hook, form elements start here

function form_casl_form($form, &$form_state) {
//sometext here
 $form['some_text'] = array(
    '#markup' => '<p><b>Simply click the button to subscribe.</b>
    </p>'
);


  //submit button
  $form['submit_button'] = array(
    '#type' => 'submit',
    '#value' => t('Subscribe'),

  );
  return $form;
}
    //validate hook

$form['#attached']['js'][] = drupal_get_path('module', 'YOURMODULE') . '/YOURMODULE.js';

Drupal.behaviors.YOURMODULE = {
  attach: function(context, settings) {
    $('.your-form-selector', context).once('YOURMODULE').delay(10000).submit();
  }
}

/**
 * Custom form handler.
 */
function FORM_EXAMPLE($form, &$form_state) {

  $form['complete_projects_radios'] = array(
    '#type'           => 'radios',
    '#title'          => t('Project status'),
    '#default_value'  => 0,
    '#options'        => array(0 => t('Current'), 1 => t('Complete')),
    // define an onChange like so:
    '#attributes'     => array(
      'onChange' => 'this.form.submit();',
    ),
  );
  $form['complete_projects_submit'] = array(
    '#type'       => 'submit',
    '#value'      => t('Apply'),
    // the submit itself is necessary, but now it can be hidden
    '#attributes' => array(
      'style' => array('display: none;'),
     ),
  );

  return $form;
}