How to get http response ?

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jQuery

Hi, I did a code to login which return json value. This code is written in jquery. When I click on login button, its not giving any response. The jquery is :

function loginEmail(par1, par2) {

            if (document.getElementById(par1).value == '') {
                alert('Please insert Email Address')
                return false;
            }
            if (document.getElementById(par2).value == '') {
                alert('Please insert Password')
                return false;
            }
            else {
                loader('lock');
                var query = 'aUserName=' + document.getElementById(par1).value + '&aPassword=' + document.getElementById(par2).value;

                function makeRequest(url) {

                    if (window.XMLHttpRequest) {
                        httpRequest = new XMLHttpRequest();
                    }
                    else if (window.ActiveXObject) {
                        try {
                            httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
                        }
                        catch (e) {
                            try {
                                httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
                            }
                            catch (e) { }
                        }
                    }

                    if (!httpRequest) {
                        alert('Giving up :( Cannot create an XMLHTTP instance');
                        return false;
                    }

                    httpRequest.onreadystatechange = alertContents;
                    httpRequest.open('POST', url);
                    httpRequest.send();
                }

                function alertContents() {
                    if (httpRequest.readyState === 4) {
                        if (httpRequest.status === 200) {
                        /*Control is not going in this if condition*/
                            if (httpRequest.response) {
                                var info = JSON.parse(httpRequest.response);
                                if (info.Error) {
                                    alert("Request cannot be completed this time. Please try again later.");
                                    loader('unlock');
                                }
                                else {
                                    /*User is logged in*/
                                    checkCookie();
                                }
                            }
                            else {
                                var l = location;
                                window.location.href = '/[#This.Clean Url Full Path]';
                            }
                        }
                        else {
                            alert('There was a problem with the request.');
                        }
                    }
                }

                makeRequest('http://dev.livestuff.com/.LoginAsJSON?' + query);
            }
        }

I am getting problem in this if condition. The control is not going in this....

if (httpRequest.response) {
}

So, How to solve this problem.
Thanks