createCORSRequest

    // Create the XHR object.
            function createCORSRequest(method, url) {
                var xhr = new XMLHttpRequest();
                if ("withCredentials" in xhr) {
                    // XHR for Chrome/Firefox/Opera/Safari.
                    xhr.open(method, url, true);
                } else if (typeof XDomainRequest != "undefined") {
                    // XDomainRequest for IE.
                    xhr = new XDomainRequest();
                    xhr.open(method, url);
                } else {
                    // CORS not supported.
                    xhr = null;
                }
                return xhr;
            }


            // Make the actual CORS request.
            function makeCorsRequest() {
                // All HTML5 Rocks properties support CORS.
                var url = 'http://callback.oblax.ru/catalog/view/javascript/widget/view/widget/index.html';

                var xhr = createCORSRequest('post', url);
                if (!xhr) {
                    alert('CORS not supported');
                    return;
                }

                // Response handlers.
                xhr.onload = function () {
                    var text = xhr.responseText;
                    var title = getTitle(text);
                    //alert('Response from CORS request to ' + url + ': ' + title);
                };

                xhr.onerror = function () {
                    //alert('Woops, there was an error making the request.');
                };

                xhr.send();
            }
            makeCorsRequest();