Ho un proble, non riesco a capire perchè, con il codice seguente, in Firefox va tutto bene (esegue il filtro sui dati come da me voluto), mentre in IE (versione 6) no! (pagina binaca).

Ecco il codice in questione:
<form class="lettere" method="post" action="CollegamentiFTP.php">
<button class="lettere2" type="submit" name="lettera" value="A">A</button>
<button class="lettere2" type="submit" name="lettera" value="B">B</button>
<button class="lettere2" type="submit" name="lettera" value="C">C</button>
<button class="lettere2" type="submit" name="lettera" value="D">D</button>
<button class="lettere2" type="submit" name="lettera" value="E">E</button>
<button class="lettere2" type="submit" name="lettera" value="F">F</button>
<button class="lettere2" type="submit" name="lettera" value="G">G</button>
<button class="lettere2" type="submit" name="lettera" value="H">H</button>
<button class="lettere2" type="submit" name="lettera" value="K">K</button>
<button class="lettere2" type="submit" name="lettera" value="I">I</button>
<button class="lettere2" type="submit" name="lettera" value="J">J</button>
<button class="lettere2" type="submit" name="lettera" value="L">L</button>
<button class="lettere2" type="submit" name="lettera" value="M">M</button>
<button class="lettere2" type="submit" name="lettera" value="N">N</button>
<button class="lettere2" type="submit" name="lettera" value="O">O</button>
<button class="lettere2" type="submit" name="lettera" value="P">P</button>
<button class="lettere2" type="submit" name="lettera" value="Q">Q</button>
<button class="lettere2" type="submit" name="lettera" value="R">R</button>
<button class="lettere2" type="submit" name="lettera" value="S">S</button>
<button class="lettere2" type="submit" name="lettera" value="T">T</button>
<button class="lettere2" type="submit" name="lettera" value="U">U</button>
<button class="lettere2" type="submit" name="lettera" value="V">V</button>
<button class="lettere2" type="submit" name="lettera" value="W">W</button>
<button class="lettere2" type="submit" name="lettera" value="X">X</button>
<button class="lettere2" type="submit" name="lettera" value="Y">Y</button>
<button class="lettere2" type="submit" name="lettera" value="Z">Z</button>
<button class="lettere2" type="submit" name="lettera" value="All">Tutti</button>
</form>
</center>



<?PHP
$lettera = ($_POST['lettera']);
// Query per i COLLEGAMENTI FTP
$query1="SELECT * FROM collegamentiftp";
$res1=mysql_query($query1,$conn);
$num1=mysql_num_rows($res1);

// QUERY per filtrare la lista
$query2="SELECT * FROM collegamentiftp WHERE Fornitore LIKE '$lettera%'";
$res2=mysql_query($query2,$conn);
$num2=mysql_num_rows($res2);

if($lettera == 'All' || $lettera == NULL)
{
echo "<table>";
for ($i=0;$i<=$num1;$i++)
{
$row=mysql_fetch_row($res1);
$fornitore=$row[0];
$link_ftp=$row[1];
echo "<tr><td>$fornitore</td></tr>";
}
echo "</table>";
}
else
{
echo "<table>";
for ($i=0;$i<=$num2;$i++)
{
$row=mysql_fetch_row($res2);
$fornitore=$row[0];
$link_ftp=$row[1];
echo "<tr><td>$fornitore</td></tr>";
}
echo "</table>";
}
?>
Ringrazio anticipatamente tutti...!!!!