jQuery.fn.extend({
        netteAjaxSubmit: function (callback) {
                var form;
                var sendValues = {};

                // odesláno na tlačítku
                if (this.is(":submit")) {
                        form = this.parents("form");
                        sendValues[this.attr("name")] = this.val() || "";

                // odesláno na formuláři
                } else if (this.is("form")) {
                        form = this;

                // neplatný element, nic nedělat
                } else {
                        return null;
                }

                // validace
                if (form.get(0).onsubmit && !form.get(0).onsubmit()) return;

                var values = form.serializeArray();

                for (var i = 0; i < values.length; i++) {
                        //var newValue = {};
                        var name = values[i].name;

                        // multi
                        if (name in sendValues) {
                                var val = sendValues[name];

                                if (!(val instanceof Array)) {
                                        val = [val];
                                }

                                val.push(values[i].value);
                                sendValues[name] = val;
                        } else {
                                sendValues[name] = values[i].value;
                        }
                }

                // odeslat ajaxový požadavek
                return jQuery.netteAjax(
                        form.attr("action"),
                        sendValues,
                        callback || null,
                        form.attr("method") || "post"
                );
        }
});