function getCookie(cookieName)
{
  var result = "";
  if (document.cookie.length)
  {
    cookieStart = document.cookie.indexOf(cookieName + "=");
    if (cookieStart != -1)
    {
      cookieStart = cookieStart + cookieName.length + 1; 
      cookieEnd = document.cookie.indexOf(";", cookieStart);
      if (cookieEnd == -1)
        cookieEnd = document.cookie.length;
      result = unescape(document.cookie.substring(cookieStart, cookieEnd));
    }
  }
  return(result);
}

function setCookie(cookieName, value, expireDays)
{
  var expDate = new Date();
  expDate.setDate(expDate.getDate() + expireDays);
  document.cookie = cookieName+ "=" + escape(value) + ((expireDays == null) ? "" : ";expires=" + expDate.toGMTString());
}