Код:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">



<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

****<title></title>

****<style type="text/css">

 * *****html, body {

 * * *margin: 0;

 * * *padding: 0;

 * * * *****height: 100%;

 * *****}

****</style>

</head>



<body>



<table width="100%" height="100%" cellpadding='0' cellspacing='0'>

****<tr>

 *<td width="100%" height="100%" align='center' valign='middle'>

 *****Я центр :-)

 *<td>

****</tr>

</table>



</body>

</html>