Tracking movieclip(s) problem

I'm having a problem trying to build a photo slide show. specifically trying to keep track of the movieclips and repositioning them. I've done this before with only two clips, but I cant seem to figure out how to keep track of the multiple (4) positions and the index position of MC in array. I don't have a script built to show, so hopefully an expianation will do?

Set up

Need to keep track of four positions, the first position has a an array item (0) half on the stage half off, position two is centered on the stage and has array item of (1). The third position is half on half off the stage (on the other side) with an array index of (2), and a forth off stage (right) with an index of (3).

* each of these MC's are not being loaded dynamically, the are on the stage, in array contains instances of MC

What I'd like to happen

after a timeout/interval all the mc's would move Right to left, into the neighbors positon, wait and repeat based on the next index of the array, and loop back to the first frame to repeat the gallery again.

I keep getting caught in a maze, of logic a think I can controll one aspect, but then the other dosen't work. Hopefully the explanation is enough for someone to help me see a solution to the maze I'm in.

(Tried yellling Odysseus but I got now secert passage to get to my solution.....Sorry old ZORK refefence I had to make)

              Thanks