problema id autoincrementale

[bstefano79]

$sql = "SELECT MAX(id_info) as maxid FROM Tabella WHERE id_annuncio=".$id;
$result = mysql_query($sql);
$nuovoId=1;
if($row = mysql_fetch_array($result))
{
    $nuovoId=$row['maxid']+1;
}
echo "NUOVO ID=".$nuovoId;