context:     function do_req( method, proc_request, url, referer, data ) {        var req = new XMLHttpRequest();        req.onreadystatechange = function() { proc_request(req) };        req.open(method, url );        if (referer != null) {            req.setRequestHeader( 'Referer', referer );        }                if (data != null) {            req.setRequestHeader( 'Content-Type', 'application/x-www-form-urlencoded' );            req.send( data );        } else {            req.send('');        }            }
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