errore run-time sconosciuto di IE6

[powerflash2]

function sndReq3(action,idoutput,operation) {
    document.getElementById(idoutput).innerHTML='[img]/img/n_loader.gif[/img]';
    http2.open('get', 'ajax_php.inc.php?'+action+'&idoutput='+idoutput+'&operation='+operation);
    http2.onreadystatechange = handleResponse3;
    http2.send(null);
} 

dice che c'è un run-time sconosciuto in questa riga


http2.open('get', 'ajax_php.inc.php?'+action+'&idoutput='+idoutput+' &operation='+operation);