/** reset all Cart totals */
 private static function reset_totals()
 {
     self::$total = 0;
     self::$cart_contents_total = 0;
     self::$cart_contents_total_ex_tax = 0;
     self::$cart_contents_weight = 0;
     self::$cart_contents_count = 0;
     self::$shipping_tax_total = 0;
     self::$subtotal = 0;
     self::$subtotal_ex_tax = 0;
     self::$discount_total = 0;
     self::$shipping_total = 0;
     self::$cart_dl_count = 0;
     self::$cart_contents_total_ex_dl = 0;
     /* for table rate shipping */
     self::$tax->init_tax();
     self::$price_per_tax_class_ex_tax = array();
     /* currently used with norway */
     fflcommerce_shipping::reset_shipping();
 }