Make AJAX calls to ASP.Net Page using JavaScript and XmlHttp

function addToFavorites(prod, box) {


    var favPage;
    var response;
    if (box.checked == true) {
        favPage = "xyz.aspx?type=add&product=" + prod;
    } else {
        favPage = "xyz.aspx?type=remove&product=" + prod;
    }
    var oXMLHttpRequest = new XMLHttpRequest;
    oXMLHttpRequest.open("GET", favPage, true);
    oXMLHttpRequest.onreadystatechange = function () {
        if (this.readyState == XMLHttpRequest.DONE) {
            response = "" + this.responseText;            
        }
    }
    oXMLHttpRequest.send(null);
}

I am using the above javascript to call a page on check box click.It is working fine on my visual studio project.

But when i deploy that it is not working.javascript is calling but not able to call that page.

I am using visual stuido 2008 / 3.5  as my devlopment server.