function fake_http_request() {
       this.readyState = 42;
       this.status = 42;
    }

    function xml_http_request(response_callback, url, method, data, async, user, password) {
        var http_request = false;
	if (method == undefined) {
	   method = 'GET';
	}
	if (data == undefined) {
	   data = null;
	}
	if (async == undefined) {
	    async = true;
	}
	if (user == undefined) {
	   user = null;
	}
	if (password == undefined) {
	   password = null;
	}

        if (window.XMLHttpRequest) {
            http_request = new XMLHttpRequest();
/*
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
            }
*/
        } else if (window.ActiveXObject) {
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
	    http_request = new fake_http_request();
            response_callback(http_request);
            return false;
        }
        http_request.onreadystatechange = function() { response_callback(http_request); };
        http_request.open(method, url, async, user, password);
        http_request.send(data);

    }