hai ragione ecco il codice :

<div align=center>
<table width="90%" border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">

<tr>
<td height="49" valign="top" width="903">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="903" height="49" valign="top" align="right" bgcolor="#00FF00">PROVA</td>
</tr>
</table>
</td>
</tr>
<tr>
<td height="160"></td>
</tr>
</table>
</div>