I know this should be easy (for anyone that knows elisp that is :)). how does one create a function that cycles up/down through a list of pre defined buffers/files?

for example i want to cycle (ie open and show in the emacs window) through:

A.org B.org C.org

i want to use ie A-left and A-right to open (if not already) and cycle through these files. any one has such a system?

best

Z