function enableDeliveryFields(sw) {
  if(sw) {
    document.checkout.name_d.disabled = false;
    document.checkout.furigana_d.disabled = false;
    document.checkout.zip_d.disabled = false;
    document.checkout.zip_d_4.disabled = false;
    document.checkout.prefecture_d.disabled = false;
    document.checkout.address_d.disabled = false;
    document.checkout.building_d.disabled = false;
    document.checkout.tel_d.disabled = false;
    document.checkout.tel_d_1.disabled = false;
    document.checkout.tel_d_2.disabled = false;
    document.checkout.email_d.disabled = false;
    document.checkout.domain_d.disabled = false;
  } else {
    document.checkout.name_d.disabled = true;
    document.checkout.furigana_d.disabled = true;
    document.checkout.zip_d.disabled = true;
    document.checkout.zip_d_4.disabled = true;
    document.checkout.prefecture_d.disabled = true;
    document.checkout.address_d.disabled = true;
    document.checkout.building_d.disabled = true;
    document.checkout.tel_d.disabled = true;
    document.checkout.tel_d_1.disabled = true;
    document.checkout.tel_d_2.disabled = true;
    document.checkout.email_d.disabled = true;
    document.checkout.domain_d.disabled = true;
  }
}

function searchzip() {
  w = open('http://search.post.japanpost.jp/7zip/', 'search'); 
  w.focus();
}