prova cosìcodice:<body> <script> var larghezza=400; var left=screen.availWidth/2-larghezza/2; document.write('<table style="position:absolute;top:10;left:'+left+'" border="1" width="'+larghezza+'">'); </script> <tr> <td width="50%"></td> <td width="50%">100</td> </tr> <tr> <td width="50%"></td> <td width="50%">100</td> </tr> </table> <script> var larghezza=400; var left=screen.availWidth/2-larghezza/2; document.write('<table style="position:absolute;top:10;left:'+left+'" border="1" width="'+larghezza+'">'); </script> <tr> <td width="50%">50</td> <td width="50%"></td> </tr> <tr> <td width="50%">50</td> <td width="50%"></td> </tr> </table> </body>