var tduid = '';
if ( window.location.href.indexOf("?") > -1 ){
  var url = window.location.href;
  var qstring = url.substr(url.indexOf("?"));
  var astring = qstring.split("&");
  for ( var iParam = 0; iParam < qstring.length; iParam++ )
  {
    if (astring[iParam].indexOf(tduid + '=') > -1 )
    {
      var aParam = astring[iParam].split("=");
      tduid = aParam[1];
      
      var expire = 1000 * 60 * 60 * 24 * 360;
      var now = new Date();
      var till = new Date(now.getTime() + expire);
      document.cookie = "tradedoubler=" + tduid + "; expires=" + till.toGMTString() + ";";
      break;
    }
  }
}

if (document.cookie) {
  var start = document.cookie.indexOf("=") + 1;
  var end = document.cookie.indexOf(";");
  if (end == -1)
    end = document.cookie.length;
  tduid = document.cookie.substring(start, end);
}