How to solve the problem of cross domain?

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jQuery

Hello, I have design a window form application, in which I call a jQuery. The script is following

<script type="text/javascript">
        var email;
        var pwd;
        function loginuser(email, pwd) {

            var query = 'aUserName=' + email + '&aPassword=' + pwd;

            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('GET', url);

                httpRequest.send();

            }




            function alertContents() {


                if (httpRequest.readyState === 4) {
                    if (httpRequest.status === 200) {
                        alert(httpRequest.status);
                        //httpRequest.open("GET", window.location.href, false);
                        //httpRequest.responseType = "document";
                        // httpRequest.send();

                        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 {
                                checkCookie();
                            }
                        } else {
                            console.log("ignoring null value");
                            alert("Request cannot be completed this time. Please try again later.");
                        }
                    }
                    else {
                        alert('There was a problem with the request.');
                    }
                }
            }

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

        }
    </script>

The control is not going inside the if(httpRequeset.Response) condition and when I print it through alert, it showing undefined alert. It may be the problem of cross domain but I am not understanding properly. So what I have to do for this where I have to change.


Thanks.