(continuous) scroll on keypress

Hi folks,

Can anyone recommend the best way to achieve the following continuous scroll effect - I want to simulate a circular room with 12 (numbered) doors in it. There are ‘sights’ over the 3 middle doors. The sights remain in the same place, but when you press the left or right arrow key the clip of the 12 doors scrolls in that direction and stop at the next door. When you scroll to the right of door 12, door 1 then becomes visible again.

Thanks.

t