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

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

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

                // invalid element, do nothing
                } else {
                        return null;
                }

                e.preventDefault();


                // validation
                if (form.get(0).onsubmit && !form.get(0).onsubmit()) {
                    e.stopImmediatePropagation();
                    return null;
                }

                if(form.data("ajaxSubmitCalled")==true) return null;

                form.data("ajaxSubmitCalled",true);

                // Tím, že zaregistruji ajaxové odeslání až teď, tak se provede jako poslední. (až po všem)
                form.one("submit",function(){
                    // get values
                    var values = form.serializeArray();

                    for (var i = 0; i < values.length; i++) {
                            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;
                            }
                    }

                    // send ajax request
                    var ajaxOptions = {
                            url: form.attr("action"),
                            data: sendValues,
                            type: form.attr("method") || "get"
                    };

                ajaxOptions.complete = function(){
                    form.data("ajaxSubmitCalled",false);
                }

                if (callback) {
                            ajaxOptions.success = callback;
                }
                    return jQuery.ajax(ajaxOptions);
                })

                e.stopImmediatePropagation();
                form.submit();
        }
});