String username = usern.getText();
                    String userpassword = pwd.getText();
                    Window.alert(userpassword+" "+username);
                    StringBuffer requestPHP = new StringBuffer();
                    requestPHP.append("?user=");
                    requestPHP.append(URL.encodeComponent(username));
                    requestPHP.append("&pass=");
                    requestPHP.append(URL.encodeComponent(userpassword));
                    try{
                        RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, "login/index.php");
                        builder.sendRequest(requestPHP.toString(), new RequestCallback(){
                            @Override
                            public void onError(Request request, Throwable exception){}
                            @Override
                            public void onResponseReceived(Request request, Response response){
                                Window.alert(response.getText());
                                        }
                        });
                    }
                    catch (RequestException e){ Window.alert(e.toString());}