I am using the same layout from: http://www.pmob.co.uk/temp/1colcentred.htm

(Thanks so much Paul O'B!!)

And I am wondering if there is any work around for the way the whole page jumps if you go from one page with no scroll to one that does scroll… See what I mean?

I cannot think of one because how can you account for the scroll bar when it is not there without it not being centered!? Seems mad!