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This could be very very easy if IE support position: fixed... But it doesn't! You alternative is a clunky amount of Javascript to recalculate the top point of the screen, or use % layer heights and scroll the bottom one to hack this functionality together. For example, the top layer would be 10% in height and the bottom layer would be 90% in height and scroll on overflow. You top layer could be your menu area which would stay static.
HTH