var today = new Date();
var zero_date = new Date(0, 0, 0);
today.setTime(today.getTime() - zero_date.getTime());
var cookie_expire_date = new Date(today.getTime() + (365 * 24 * 60 * 60 * 1000));

function get_cookie(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 set_cookie(name, value, expires, path, domain, secure)
{
  var cookieString = name + "=" +escape(value) +
    ( (expires) ? ";expires=" + expires.toGMTString() : "") +
    ( (path) ? ";path=" + path : "") +
    ( (domain) ? ";domain=" + domain : "") +
    ( (secure) ? ";secure" : "");
  document.cookie = cookieString;
}

var r = document.referrer;
var d = get_cookie("c_date");
var p = window.location.href;

if (d == null || d.length == 0)
  if (r != null && r.length > 0)
  {
    set_cookie("c_ref", r, cookie_expire_date);
    set_cookie("c_url", p, cookie_expire_date);
    set_cookie("c_date", Date(), cookie_expire_date);
  }