add: return false; 
context: QxXmlHttpTransport.isSupported = function(){  // Temporary to test the iframe alternative  // return false;  if (window.XMLHttpRequest)  {    // QxDebug("QxXmlHttpTransport", "Using XMLHttpRequest");    QxXmlHttpTransport.createRequestObject = QxXmlHttpTransport._createNativeRequestObject;    return true;  };  if (window.ActiveXObject)  {    var vServers = [ "MSXML2.XMLHTTP.6.0", "MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP.2.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP" ];    var vObject;    var vServer;    for (var i=0, l=vServers.length; i<l; i++)    {      vServer = vServers[i];      try      {        vObject = new ActiveXObject(vServer);        break;      }      catch(ex)      {        vObject = null;      };    };    if (vObject)    {      // QxDebug("QxXmlHttpTransport", "Using ActiveXObject: " + vServer);      QxXmlHttpTransport._activeXServer = vServer;      QxXmlHttpTransport.createRequestObject = QxXmlHttpTransport._createActiveXRequestObject;      return true;    };  };  return false;};
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/a9fe42121d03bf61e5b50f84f1ce19c75ef71fdf/QxXmlHttpTransportCore.js/clean/qooxdoo/source/script/transport/QxXmlHttpTransportCore.js