$(function () {
    var tabContainers = $('div.productImage > div');
    tabContainers.hide().filter(':first').show();
    
    $('div.product ul.productNav3 a').click(function () {
        tabContainers.hide();
        tabContainers.filter(this.hash).fadeIn('normal');
        $('div.product ul.productNav3 a').removeClass('selected');
        $(this).addClass('selected');
        return false;
    });
});