what hoax said. design your pages so they look good if someone maximizes it at 1024x768 and if someone runs it at 640x480 (non-maximized on 800x600, potentially).
if you must design for a specific resolution, consider popping your site up in a new window with the exact size you need and w/o scrollbars. it'll be fugly, and will piss off surfers, but probably not as much as designing it for a specific resolution will in the first place.
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