enable

(function ($) {
    $.fn.extend({
        enable: function (func) {
            if (func == undefined) {
                $(this).css("opacity", "1");
            } else {
                func();
            }

            restoreEvents($(this));

            function restoreEvents(obj) {
                if (obj.data("listEvents") == undefined) return;

                var objThis = obj;
                var events = obj.data("listEvents");

                $.each(events, function (i, item) {
                    objThis.on(item.event, null, null, item.func);
                });
            }
        }
        , disable: function (func) {
            var objThis = $(this);

            if (func == undefined) {
                $(this).css("opacity", "0.3");
            } else {
                func();
            }

            storeEvents(objThis);

            var events = objThis.data("listEvents");
            if (events == undefined) return;
            $.each(events, function (i, item) {
                objThis.off(item.event);
            });
            
            function storeEvents(obj) {
                if (obj.data("events") == null) { return; }

                var list = [];
                $.each(obj.data("events"), function (i, event) {
                    $.each(event, function (j, h) {
                        list.push({ event: h.type, func: h.handler });
                    });
                });

                obj.data("listEvents", list);
            }
        }
    });
})(jQuery);