function update_end_date(end_date_element_name, start_date_element_name) {
  if ($F(end_date_element_name + '_selected') == '1') {
    return;
  }
  date = new Date($F(start_date_element_name + '_3'), $F(start_date_element_name + '_2'), $F(start_date_element_name + '_1'));
  date.setDate(date.getDate()+1);
  $(end_date_element_name + '_3').value = date.getFullYear();
  $(end_date_element_name + '_2').value = date.getMonth();
  $(end_date_element_name + '_1').value = date.getDate();
}

function set_field_updated(field) {
  field.value = '1';
}