// shipping options: radio button text, value
//(quantity ordered not taken into account in this form)
$ship_options = array (
array ("Pick up locally", "0"),
array ("UPS Ground", 5),
array ("Fed Ex Overnight", 20)
);

Contry 1st item 2nd items +
Canada 6.50$ 6.50$ + 2.50$/additional item
USA 8.50$ 8.50$ + 3.50$/additional item
Others countries 9.75$ 9.75$ + 4.50/additional item
and for more than 9 item, call for prices.

// shipping options
$qty = "quantity";
$qtyship = "commande";
$qtyship = "$qty-1";
$ship_options = array (
array ("Le Canada:", 6.50+$qtyship*2.50),
array ("Les U.S.A.:", 8.50+$qtyship*3.50),
array ("Autres pays:", 9.50+$qtyship*4.50)
);