When content fits inside the browser window (no scrollbar required in this case) FF and Opera do not render 'an empty scrollbar' as IE does - and as a result - (again in the case of FF and Opera) the window 'reinterprets the center and shifts the layout left a wee bit --- argh
I prefer IE logic on this one since when deving off localhost and jumping around from page to page - when FF or OP enconters 'fitable content' the layout shifts left noticably - to be honest i thought this was an error in my code - until I did an array of tests (several hours) - determining that this is default behavior of FF and OP - I prefer IE's logic - which eliminates the shift left - which from a designer's point of view seems a wee bit quirky.
Might be a workaround - but i doubt it - just defaults for these browsers.
oh well....
still learning
