make 2d ship tilt when up and down?

im making a 2d shmup side view, r-type style im gonna use 2d images for the ship. i need to make the ship tilt when it moves up the screen, and tilt when it moves down. i have 5 frames images of the ship tilting when it goes up, and 5 frames when it tilts down. does anyone know how i can go about this?