I've found the original tutorial the other one was the perspective scroll way to complexthis is the tutorial although some of the images are missing so you'll have to guess there
web.archive.org/web/20090101114012/http://www.maidenart.co.uk/scrolling-background.html
(web.archive.org/web/20090101114012/http://www.maidenart.co.uk/scrolling-background.html
maiden is filmed before a live studio audience,
Tue 10 Jan 2012, 11:24,
archived)