ok benissimo! ora mi genera le tabelle con i dati, che grzie al limit 0,20 genera 20 tabelle.
ora pero' x finire ho bisogno di conta pagine, ma questo codice mi genera errore:

<table width=90% border=0><tr>
<td width=20% align=left>
<?
if ($start>0)
{ $start_back = $start - $step;
echo "<a href=all.php?start=$start_back>precedenti</a>";
}
?>
</td>
<?
$query = "SELECT count (*) AS tot FROM news_video_phone";
$result = mysql_query($query, $db);
$row = mysql_fetch_array($result);
$pages = intval(($row[tot]-1) / $step)+1;
?>
<td width=60% align=center>
<?
for ($i=0; $i<$pages AND $i<20; $i++)
{ $start_page = $i * $step;
echo "<a href=all.php?start=$start_page>" . ($i+1) . "</a> ";
}
?>
</td>
<td width=20%>
<?
if ($start + $step < $row[tot])
{ $start_next = $start + $step;
echo "<a href=all.php?start=$start_next>successivi</a>";
}
?>
</td>
</tr></table>

errore:
Warning: mysql_fetch_array(): on line 1262
riga:
$row = mysql_fetch_array($result);