Cover bottom of lasagne pan with 1/3 of the sauce. Arrange layer of uncooked noodles (5-6 pcs) on bottom. Cover with second 1/3 of the sauce. Combine ricotta, parmesan, and spinach and spoon 1/2 of the mixture over the noodles. Put a second layer of noodles over the cheese mixture, then the rest of the cheese mixture. Cover with remaining sauce. Top with the mozarella and jack. Cover with foil, domed so that cheese doesn't stick to the top. Bake 45 minutes @ 375. Remove foil and bake 20 minutes more. Allow to set for 1/2 hour before cutting to serve.