Thanks for posting this, Monica. I've got the problem, too, on several new sites I've designed. I've been researching this for a while now, and have tried making the pages the same length, making the copy the same length, forcing scrollbars into the pages via CSS tricks, blah, blah. I honestly never noticed it before. Here's a site under development where the problem is quite pronounced. I just rebuilt the entire site from scracth, each page was duplicated from the index one at a time, just to make sure there were no sizing issues from page to page. In that test, no jump when I added "Services" and "Gallery"; once I'd added "Quote" and "About Us", the jiggling started to appear when navigating back towards "Home". (Hope that makes sense). Again, this site is under development, so it's raw right now:

http://extremelogorugs.com/new/index.htm

Dave