function this_year() {
  dd = new Date();
  yy = dd.getYear();
  if (yy < 2000) { yy += 1900; }
  return (yy);
}

function count_day() {
  var s_year = parseFloat(document.form_mail.s_year.value);
  var s_month = parseFloat(document.form_mail.s_month.value) - 1;
  var s_day = parseFloat(document.form_mail.s_day.value);
  s_date = new Date(s_year, s_month, s_day);
  s_date_sec = s_date.setTime(s_date.getTime());
  var e_year = parseFloat(document.form_mail.e_year.value);
  var e_month = parseFloat(document.form_mail.e_month.value) - 1;
  var e_day = parseFloat(document.form_mail.e_day.value);
  e_date = new Date(e_year, e_month, e_day);
  e_date_sec = e_date.setTime(e_date.getTime());
  d_count = (e_date_sec - s_date_sec) / 24 / 3600 /1000 + 1;
  if (isNaN(d_count)) {
    d_count = "--";
  }
  document.form_mail.day_count.value = d_count;
  return (d_count);
}

function input_price() {
  document.form_mail.ticket_price.value = "";
  document.form_mail.ticket_price.focus();
}

function non_price() {
  document.form_mail.ticket_price.value = "----";
}

function ht_formCf() {
  with (document.form_mail) {
    if (name.value==""){
	  alert("ご担当者のお名前を入力してください");
	  name.focus();
	  return(false);
	}
	if (email.value==""){
	  alert("E-mailを入力してください");
	  email.focus();
	  return(false);
	}
	var d_count = count_day();
	if (d_count <= 0) {
	  alert("公演希望日を正しく入力してください");
	  s_year.focus();
	  return(false);
	}
  }
  if (window.confirm("入力内容を確認してください。\n送信してよろしいですか？")) {
	return(true);
  }
  return(false);
}