function fn_getajax(sURL, callback_function, return_xml, parameter1, parameter2) {
    var http_request = false;

	sURL += ( ( sURL.indexOf('?') + 1 ) ? '&' : '?' ) + ( new Date() ).getTime(); //prevent cache

    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            //return_xml = true;
            if (return_xml) {
                http_request.overrideMimeType('text/xml; charset=utf-8');
            } else {
                http_request.overrideMimeType('text/html; charset=utf-8');
            }
        }
    } else if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }

    if (!http_request) {
        alert('Unfortunatelly you browser doesn\'t support this feature.');
        return false;
    }
    http_request.onreadystatechange = function() {
        if (http_request.readyState == 4) {
            if (http_request.status == 200) {
                //return_xml = true;
                try {
                    if (return_xml) {
                        //http_request.responseXML
                        //eval(callback_function + '(http_request.responseXML)');
                        eval(callback_function + '(http_request, \'' + parameter1 + '\', \'' + parameter2 + '\')');
                    } else {
                        //http_request.responseText
                        eval(callback_function + '(http_request.responseText, \'' + parameter1 + '\', \'' + parameter2 + '\')');
                    }
                }
                catch (Exc) { }
            } else {
                alert('There was a problem with the request.(Code: ' + http_request.status + ')');
            }
        }
    }
    http_request.open('GET', sURL, true);
    http_request.send(null);
}