function disable_shipping()
{
    if(document.thisform.same_address.checked) {
        document.thisform.f_ship_name.value = document.thisform.f_bill_name.value;
        document.thisform.f_ship_ad1.value = document.thisform.f_bill_ad1.value;
        document.thisform.f_ship_ad2.value = document.thisform.f_bill_ad2.value;
        document.thisform.f_ship_city.value = document.thisform.f_bill_city.value;
        document.thisform.f_ship_state.value = document.thisform.f_bill_state.value;
        document.thisform.f_ship_zip.value = document.thisform.f_bill_zip.value;

    } else {
        document.thisform.f_ship_name.value = "";
        document.thisform.f_ship_ad1.value = "";
        document.thisform.f_ship_ad2.value = "";
        document.thisform.f_ship_city.value = "";
        document.thisform.f_ship_state.value = "";
        document.thisform.f_ship_zip.value = "";

    }
}