function getCookie(name) {
  var start = document.cookie.indexOf(name + "=");
  var len = start + name.length + 1;
  
  if ((!start) && (name != document.cookie.substring(0, name.length)))
    return null;

  if (start == -1)
    return null;

  var end = document.cookie.indexOf(";", len);

  if (end == -1)
    end = document.cookie.length;

  return unescape(document.cookie.substring(len, end));
}


function deleteCookie(name, path, domain) {
  if (getCookie(name))
    document.cookie = name + "=" + ((path) ? ";path=" + path : "") + ((domain) ? ";domain=" + domain : "") + ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}