function getCookie(name) {
  var search = name + "=";
  var ret = "";
  if (document.cookie.length > 0) {
    offset = document.cookie.indexOf(search);
    if (offset != -1) { 
      offset += search.length;
      end = document.cookie.indexOf(";", offset);
      if (end == -1) end = document.cookie.length;
      ret=unescape(document.cookie.substring(offset, end))
      }
   }
  return ret;
}

if (!getCookie('r') && document.referrer) {
	document.cookie = "r="+escape(document.referrer);
}