problema con elenco categorie e sottocategorie

[prinzart]

ho provato così ma non mi funziona

    <?
    $query10="SELECT d_protocollo_categ.*
            FROM d_protocollo_categ";
    $ris_query10=mysql_query($query10, $conn);
    $query20="SELECT d_protocollo_sottocateg.*
            FROM d_protocollo_sottocateg";
    $ris_query20=mysql_query($query20, $conn);
    while($row10=mysql_fetch_array($ris_query10), $row20=mysql_fetch_array($ris_query20)){?>

     <tr>
    <td height="41"><span class="testo_rosso_bold"><a href="<?=$PHP_SELF?>?protocollo_categ=<?=$row10[id_protocolli_categ]?>&pagina=2" class="tre">[img]../images/menu_triangolo.gif[/img]
      <?=$row10['numero_categ']?></a></span></td>
    <td align="left"><span class="testo_rosso_bold"><?=$row10['nome_categ']?>
    </span></td>
    </tr>
      <tr>
    <td height="1" colspan="2" valign="top" bgcolor="BE743F"></td>
    </tr>
     <tr>
    <td height="41"><span class="testo_rosso_bold"><a href="<?=$PHP_SELF?>?protocollo_categ2=<?=$row20[id_protocolli_categ2]?>&pagina=2" class="tre">[img]../images/menu_triangolo.gif[/img]
      <?=$row20['numero_sottocateg']?></a></span></td>
    <td align="left"><span class="testo_rosso_bold"><?=$row20['nome_sottocateg']?>
    </span></td>
    </tr>
      <tr>
    <td height="1" colspan="2" valign="top" bgcolor="BE743F"></td>
    </tr>