Try this: 


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html>

        <head>

                <title>

                        table test

                </title>

                <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

                <style type="text/css">

                        html,body { text-align: center; margin: 0px; padding: 0px; height: 100%; }

			table.mytable  { width: 100%; height: 100% }

			td.hundred { width: 100%; height: 100%; vertical-align: top; border: solid 2px #000 }

			td.sixty   { width: 100%; height: 60px; vertical-align: top; border: solid 2px #000 }

                </style>

        </head>

        <body>

                <table class="mytable">

                <tr><td class="sixty">top</td></tr>

                <tr><td class="hundred">bottom</td></tr>

                </table>

        </body>

</html>