How to create alternating image with target

How can i create an alternating banner image using javascript with each image has its own url target. and uses cookie to display

Thanks.

Do you mean something like this

www.huntingground.freeserve.co.uk/scripts/cookies/rdm_img.htm

or this

www.huntingground.freeserve.co.uk/scripts/cookies/seq_img.htm

Thanks MR J! this is perfect.