Also, for he hidden field on the confirm page do I add:
<input type="hidden" name="FedEx_Service" id="FedEx_Service" value="<?php echo((isset($_POST["FedEx_Service"]))?$_POST["FedEx_Service"]:"") ?>" />
<input type="hidden" name="FedEx_Carrier" id="FedEx_Carrier" value="<?php echo((isset($_POST["FedEx_Carrier"]))?$_POST["FedEx_Carrier"]:"") ?>" />
or is this not right either?