[HELP] How to access posts individually from The Loop ?!?

Hello.
Im writing a new template and I want to displace each post in a different position (total of 4 posts per page). To do so I created the various DIV containers and associated a class + ID to each of them (box1, box2, box3, etc.)

How can I put each one post in each one container?
post 1 -> box 1
post 2 -> box 2
etc.

I’d also like to create an ‘Older post’ function where I shift the content of the boxes (content of box2 -> goes into box1 etc.)
I think I will use Ajax + jQuery for this…

Any ideas?

THANKS