$(function () {
        var tabContainers = $('div.productDetails > div');
        tabContainers.hide().filter(':first').show();
        
        $('div.product ul.productNav a').click(function () {
            tabContainers.hide();
            tabContainers.filter(this.hash).fadeIn('normal');
            $('div.product ul.productNav a').removeClass('selected');
            $(this).addClass('selected');
            return false;
        });
    });