function checkform ( form )
{
  // see http://www.thesitewizard.com/archive/validation.shtml
  // for an explanation of this script and how to use it on your
  // own website

  // ** START **
  if (form.first_name.value == "") {
    alert( "Please enter your first name." );
    form.first_name.focus();
    return false ;
  }


  if (form.last_name.value == "") {
    alert( "Please enter your last name." );
    form.last_name.focus();
    return false ;
  }



  if (form.address.value == "") {
    alert( "Please enter your address" );
    form.address.focus();
    return false ;
  }


  if (form.postcode.value == "") {
    alert( "Please enter your postcode" );
    form.postcode.focus();
    return false ;
  }



  if (form.country.value == "") {
    alert( "Please enter your country" );
    form.country.focus();
    return false ;
  }


  if (form.telephone.value == "") {
    alert( "Please enter your telephone" );
    form.telephone.focus();
    return false ;
  }



  if (form.email.value == "") {
    alert( "Please enter your email" );
    form.email.focus();
    return false ;
  }


  if (form.return_flight_departure_time.value == "") {
    alert( "Please enter your return flight departure time" );
    form.return_flight_departure_time.focus();
    return false ;
  }


  if (form.return_flight_arrival_time.value == "") {
    alert( "Please enter your return flight arrival time" );
    form.return_flight_arrival_time.focus();
    return false ;
  }



  if (form.hotel_name.value == "") {
    alert( "Please enter your hotel name" );
    form.hotel_name.focus();
    return false ;
  }


  if (form.card_type.value == "") {
    alert( "Please enter your card type" );
    form.card_type.focus();
    return false ;
  }


  if (form.card_number.value == "") {
    alert( "Please enter your card number" );
    form.card_number.focus();
    return false ;
  }

  if (form.valid_from.value == "") {
    alert( "Please enter your valid from date" );
    form.valid_from.focus();
    return false ;
  }

  if (form.expiry_date.value == "") {
    alert( "Please enter your expiry date" );
    form.expiry_date.focus();
    return false ;
  }

  

  if (form.CV2.value == "") {
    alert( "Please enter your CV2 number" );
    form.CV2.focus();
    return false ;
  }
  
    if (form.agree.value == "") {
    alert( "Please agree to our terms" );
    form.agree.focus();
    return false ;
  }
  
  // ** END **
  return true ;
}