function checkform ( form )
{

  // EMAIL contact form
  if (form.forename.value == "") {
    alert( "Please enter your first name." );
    form.forename.focus();
    return false ;
  }
  
  if (form.surname.value == "") {
    alert( "Please enter your last name." );
    form.surname.focus();
    return false ;
  }  
  
  if (form.arrival_date.value == "") {
    alert( "Please enter your arrival date." );
    form.arrival_date.focus();
    return false ;
  }
  
  if (form.telno.value == "") {
    alert( "Please enter your contact telephone number." );
    form.telno.focus();
    return false ;
  }  
  
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    form.email.focus();
    return false ;
  }  
  
  if (form.code_post_text.value == "") {
    alert( "Please enter the security code as you see it in the image." );
    form.code_post_text.focus();
    return false ;
  }   

  // ** END **
  return true ;
}