function getCookie(key) {
  for (n = 0, s = " " + document.cookie + ";"; n < s.length;) {
    i = s.indexOf(";", n + 1);
    j = s.indexOf("=", n + 1);
    if (s.substring(n + 1, j) == key) {
      return unescape(s.substring(j + 1, i));
    }
    n = i + 1;
  }
  return "";
}

function setCookie(key, value) {
  document.cookie = key + "=" + escape(value) + "; expires=31-Dec-2030 23:59:59;";
}

function clearCookie(key) {
  document.cookie = key + "=; expires=1-Jan-1997 00:00:00;";
}