scusami ho sbagliato io

<table width="70%" border="0">

<tr>
<?php
include 'config.php';
include 'connx.php';
$query="SELECT * FROM prova WHERE utile='Si'";
$ris=mysql_query($query, $db);

while ($row=mysql_fetch_array($ris)){

$nome = $row[nome];
$cognome = $row[cognome];
?>

<td width="24%"><?=$nome?> </td>
<td width="24%"><?=$cognome?></td>
<td width="18%"> </td>

<?
}
?>
</tr>
</table>