var http_request = false;

function makeRequest(url) {
    http_request = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/xml');
        }
    }
    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('Cannot create XMLHTTP instance');
        return false;
    }
    http_request.onreadystatechange = alertContents;
    http_request.open('GET', url, true);
    http_request.send(null);
}

function alertContents() {
    if (http_request.readyState == 4) {
        if (http_request.status == 200) {
            var xmldoc = http_request.responseXML;
            //alert("ok");
        }
        else {
            //alert('There was a problem with the request.');
        }
    }
}

function track(keyword, url, paid, sess) {
    var requestUrl;
    requestUrl = "Track.ashx?q=" + keyword + "&url=" + url + "&pl=" + paid + "&sess=" + sess;
    //alert(requestUrl);
    makeRequest(requestUrl);
}