a: " + JSON.stringify(data));
                    if ("current_block" in data && data["current_block"] != null && 
                        "block_height" in data && data["block_height"] != null && 
                        "progress" in data && data["progress"] != null) {
                        if (current_block != parseInt(data["current_block"])) {
                            $("#current_block").fadeOut(250, function() {
                                $(this).text(data["current_block"]);
                 