Hmmnnn, I just figured I could use this method :
if (isset($_POST['shipSelect']) && ($_POST['shipSelect']==$groundShip)) {
$_SESSION["eCartCheckoutForm_shipping_method"] = 'Ground';
} elseif (isset($_POST['shipSelect']) && ($_POST['shipSelect']==$twoDayAir)) {
$_SESSION["eCartCheckoutForm_shipping_method"] = '2 Day Air';
I'll test my solution then use yours if it falis. Thanks for the fast reply.