browser size

Is it acceptable when going from 1024x768 to 800x600 to have some horizontal
scrolling, or is there some better way to avoid this. I am assuming that my
pictures are to big/wide, but I like the size and am not if I should change,
if more people will see them at 1024 than at 800. Here is a test link that
I am using until I get the spacing right

http://www.serendipity-designs.net/test/main.htm

thank you

Paul