$.tabs = function (selector, start) {
    $(selector).each(function (i, element) {
        $($(element).attr('tab')).css('display', 'none');

        $(element).click(function () {
            $(selector).each(function (i, element) {
                $(element).removeClass('selected');

                $($(element).attr('tab')).css('display', 'none');
            });

            $(this).addClass('selected');

            $($(this).attr('tab')).css('display', 'block');
        });
    });

    if (!start) {
        start = $(selector + ':first').attr('tab');
    }

    $(selector + '[tab=\'' + start + '\']').trigger('click');
};