$.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');
};