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I always have this declaration on my websites:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
I've always tested my websites in IE6 and they looked as good as they are in Firefox and Opera, and I never really witnessed the box model problem.