[SOLVED] Slight page shift when adding inner sidebar to a single page

Hi

I apologize as I just don't know how to word this or search for it. My blog is at blog.camerajazz.com.

I have one page only - the 'This is me' page - on which I'm using an inner sidebar instead of no sidebar or the regular right sidebar.

I notice that when I bring up that page, my whole site shifts slightly to the right. If I'm looking at my logo for example, it 'jumps' to the right when compared to the other pages. By some trial and error if I change my sidebar width to 150 the page is ok. Anything less and the 'jump' starts happening. However I want this sidebar to have a width of 100.

Is this just a mystery or do have any idea of what I can do to prevent the 'jump' - maybe no-one would ever notice, but I think it looks unprofessional. Any help vastly appreciated!!!!

Nicole
P.S. Better this than my almost frantic post yesterday when I made the entire site disappear by trying to edit CSS. Luckily restored via FTP. I won't be doing that again!