(function($) {
    $.fn.enable = function() {
        // Enable each selected element by removing its 'disabled' attribute.

        return this.each(function() {
            $(this).removeAttr('disabled');
        });
    };

    $.fn.disable = function() {
        return this.each(function() {
            // Disable each selected element that is a form control by setting
            // its 'disabled' attribute.

            if ($(this).is(':input')) {
                $(this).attr('disabled', 'disabled');
            }
        });
    };
})(jQuery);