function dzial() {
    global $co;
   echo ' <table align="center" class="news">
<form method=POST action="'.$PHP_SELF.'?co='.$co.'&bim=dodaj_dzial"">
             <tr>
  <TD bgcolor="'.$bg.'" class="news"><b>Tytul:</b>                            </td>
  <TD bgcolor="'.$bg.'" class="news"><b><input type="text" name="tytul" size="30" value="'.$title.'"></b>                            </td>
  </tr>

<tr><td align="right" valign="top" class="uni_01">dzial:</td>  
<td class="tekst">  

<select name="dzial">  
<option value="0">Główny dział</option>';  
  
$query = "SELECT * FROM dzialy co_pod='0'";  
$result = mysql_query($query);  
while($r = mysql_fetch_array($result)){  


$copod = $r['nazwa'];  
$id = $r['id'];
$czypoddzial = $r['co_pod'];  

      
     $query3 = "SELECT * FROM dzialy WHERE co_pod='$id'";  
$result3 = mysql_query($query3);  
while($r3 = mysql_fetch_array($result3)) {  
$podco = $r3['nazwa'];  
        $idi = $r3['id'];
           $copod2 = $r3['co_pod'];  
    

       echo'<option value="'.$id.'">'.$copod.'</option>';  


echo'<option value="'.$idi.'"> - '.$podco.'</option>';  

}
}  
  



echo '</select></td>  
</tr>

</table>
<input type="submit" value="Wyslij">

</form>';
  }

Main (id 1)
-- subMain1.1 (id 1)-> SELECT * FROM subcategories WHERE category = `1`
---- subsubMain1.1.1 (id 1)-> SELECT * FROM subsubcategories WHERE subcategory = `1`
---- subsubMain1.1.2 (id 2)-> SELECT * FROM subsubcategories WHERE subcategory = `1`
-- subMain1.2 (id 2)-> SELECT * FROM subcategories WHERE category = `1`
---- subsubMain1.2.2 (id 1) -> SELECT * FROM subsubcategories WHERE subcategory = `2`

Main2 (id 2)
-- subMain2.1 (id 1)-> SELECT * FROM subcategories WHERE category = `2`
---- subsubMain2.1.1 (id 1)-> SELECT * FROM subsubcategories WHERE subcategory = `1`
---- subsubMain2.1.2 (id 2)-> SELECT * FROM subsubcategories WHERE subcategory = `1`
-- subMain2.2 (id 2)-> SELECT * FROM subcategories WHERE category = `2`
---- subsubMain2.2.2 (id 1) -> SELECT * FROM subsubcategories WHERE subcategory = `2`