function kakunin() {
  if (document.form.name.value == "") {
    alert("Please write your name");
    document.form.name.focus();
    return(false);
  }
  if (document.form.email.value == "") {
    alert("Please write your e-mail address");
    document.form.email.focus();
    return(false);
  }
  if (document.form.title.value == "") {
    alert("Please write contact title");
    document.form.title.focus();
    return(false);
  }
  if (document.form.contact.value == "") {
    alert("Please write contact form");
    document.form.contact.focus();
    return(false);
  }

  return(true);
}