(function($) {
    $.extend($.fn, {
        defaultButton: function(selector) {
            this.keypress(function(e) {
                if (e.which == 13 && e.target.type != 'textarea') {
                    var tmpBtn = $(this).find(selector);
                    if (tmpBtn[0].type == 'submit')
                        tmpBtn[0].click();
                    else if ($(tmpBtn[0]).attr('onclick')) {
                        var ret = $(tmpBtn[0]).attr('onclick')();
                        if (ret)
                            eval(unescape(tmpBtn[0].href));
                    }
                    else
                        eval(unescape(tmpBtn[0].href));
                    return false;
                }
            });
        }
    });
})(jQuery);