Another way of approaching this would be to use percentages to govern the width of the central portion of your site, and then use pixels to define boundaries. In CSS, it would mean a rule something like this:
Assuming your content is contained in a DIV with an ID of "content", the width of the content would be 80% of the width of its container (perhaps the BODY, depending on your markup), but would never get narrower than 750px or wider than 1000px. The margin rules center the content within the container.
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