How to make my bg image slide without affecting page size?

How to make my bg image slide without affecting page size?

I want to make my background slide from left to right continuously made up of 3-4 images which keeps on going like:
img1 img2 img3 img4
img2 img3 img4 img1
img3 img4 img1 img2
img4 img1 img2 img3
img1 img2 img3 img4

How can I do this...Is there anyone who can provide me an example or help me out through some useful link?
Thank you