function showProductBlock(productBox)
{
    if (productBox == 'product_description') {
        $('product_description').show();
    } else {
        $('product_description').hide();
    }

    if (productBox == 'product_features') {
        $('product_features').show();
    } else {
        $('product_features').hide();
    }

    if (productBox == 'product_specifications') {
        $('product_specifications').show();
    } else {
        $('product_specifications').hide();
    }
}