Hi,
how would you prefill a form element with value from a select list? What I have to do to transmit values via from one element to an other?

$form['profile_img_download']['format'] = array(
    '#type' => 'select',
    '#title' => t('Choose format for download'),
    '#redirect' => '',
    '#options' => $form['path_options']['#value'],
    '#default_value' => $usage_default_value,
    '#ahah' => array(
      'event'   => 'change',
      // This is the "magical path". Note that the parameter is an array of
      // the parents of the form item of the wrapper div!
      'path'    => ahah_helper_path(array('profile_img_download', 'format')),
      'wrapper' => 'dependent-dropdown-wrapper',
      // 'event' => 'change', // default value: does not need to be set explicitly.
    ),
    '#attributes' => array('class' => 'master-dropdown'),
      '#description' => t(''),
  );
$form['profile_img_download']['download'] = array(
   '#type'      => 'textfield',
      '#title'     => t('Company name'),
      '#required'  => TRUE,
      '#size'      => 20,
      '#maxlength' => 255,
      // If the user switched to Private usage and back to Company usage, we
      // remembered his company's name!
      //'#default_value' => $form_state['storage']['profile_img_download']['format'],
   '#default_value' => 'name',
   );