A table around the body tags? I hope that is not what you did
Tables really aren't the way to go here...you want to use CSS. You can set a min-height to a <div> tag, as well as a fixed height, so I'd suggest using a <div> wrapper with a fixed height if that is what you want to achieve. You just need to be careful that your content doesn't overlap that height. Did you want to add scrollbars if the content does go past the height?