          on_init: function(elem, options) {
                        // open collapse (and all collapse parents) in case of errors
                        if (elem.find("ul.errorlist").length > 0) {
                            elem.removeClass("grp-closed")
                                .addClass("grp-open");
                            elem.parents(".grp-collapse")
                                .removeClass("grp-closed")
                                .addClass("grp-open");
                        }
 