Formular s vyberom kraja a nasledne mesta

<select id="kraj" name="kraj">
<option value="" selected="selected">Zvoľte kraj</option>
<option value="Banskobystrický">Banskobystrický</option>
<option value="Bratislavský" >Bratislavský</option>
<option value="Košický" >Košický</option>
<option value="Nitriansky" >Nitriansky</option>
<option value="Prešovský" >Prešovský</option>
<option value="Trenciansky" >Trencianky</option>
<option value="Trnavský" >Trnavský</option>
<option value="Žilinský" >Žilinský</option>
</select>

switch ($_POST['kraj'])
{
   case 'bb': echo "formular s moznostami pre BB kraj"; break;
   case 'ba': atd.
}

<script type="text/javascript">
secondDimension=[
 ['The Matrix','The Chronicles of Narnia'],
 ['Boys','Girls']
];
thirdDimension={
 '0.0':['Neo','Smith','Trinity','Morpheus'],
 '0.1':['Peter','Susan','Edmund','Lucy','Aslan','The White Witch'],
 '1.0':['Michael','Kenny','Lee','Mendel','Lorence'],
 '1.1':['Michelle','Jessica','Lorine','Veronica','Jennifer','Samantha']
};
</script>

<select id="category" name="category" onchange="applyCategory(this)">
<option value="-1" selected>Select One</option>
<option value="0">Movies</option>
<option value="1">Cool Baby Names</option>
</select>

<div id="findings1"></div>
<div id="findings2"></div>

<script type="text/javascript">
function applyCategory(t){
var e2=document.getElementById("findings2");if(!e2)return;
while(e2.firstChild)e2.removeChild(e2.firstChild);//clear subsubcats
e1=document.getElementById("findings1");if(!e1)return;
while(e1.firstChild)e1.removeChild(e1.firstChild);//clear subcats
if(t.value==-1)return;

var newList=secondDimension[t.value];if(!newList)return;
var s=document.createElement("select");
s.id="subcategory";
s.name="subcategory";
s.onchange=new Function("applySubCategory(this)");
s.options[s.options.length]=new Option("Select One",-1);
for(var i=0;i<newList.length;i++){
s.options[s.options.length]=new Option(newList[i],i);

}
e1.appendChild(document.createElement("br"));
e1.appendChild(document.createTextNode("\xa0\xa0\xa0\xa0"));//four nobreak spaces
e1.appendChild(s);
}

function applySubCategory(t){
var e2=document.getElementById("findings2");if(!e2)return;
while(e2.firstChild)e2.removeChild(e2.firstChild);//clear subsubcats
var c=document.getElementById("category");if(!c)return;
if(t.value==-1)return;


var idx=c.value +'.'+ t.value;
var newList=thirdDimension[idx];if(!newList)return;
var s=document.createElement("select");
s.id="subsubcategory";
s.name="subsubcategory";
s.options[s.options.length]=new Option("Select One",-1);
for(var i=0;i<newList.length;i++)s.options[s.options.length]=new Option(newList[i],i);
e2.appendChild(document.createElement("br"));
e2.appendChild(document.createTextNode("\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0"));//eight nobreak spaces
e2.appendChild(s);
}

</script>

<form name="myform" method="post" action="registracia_okresu.php">
<table width=100% cellpadding=2 cellspacing=2 border=0>
<tr>
<td colspan='2' align='center'><strong><br /><br /><br /><br />Vyberte región
           </strong></td>
</tr>
   <tr>
      <td align="center">Vyberte kraj</td>
        <td>
       <select name="country" id="country" onchange="set_player()">
<option selected value=''>Zvoľte kraj
<option value='Banskobystrický'>Banskobystrický
<option value='Bratislavský'>Bratislavský
<option value='Košický'>Košický
<option value='Nitriansky'>Nitriansky
<option value='Prešovský'>Prešovský
<option value='Trenčiansky'>Trenčiansky
<option value='Trnavský'>Trnavský
<option value='Žilinský'>Žilinský
</select>
</td>
   </tr><tr>
    <td align="center">Vyberte okres:</td>
<td>
    <select name="player" id="okres">
    <option value="">------
    </select>
    </td></tr>
      <tr>
      <td colspan="2" align="center"><input type='submit' name='submit' value=' Ďalej ->> '></td>
   </tr>
</table>
</form>

var banskabystrica= new Array("Banská Bystrica","Banská Štiavnica","Brezno","Detva","Krupina","Lučenec","Poltár","Revúca","Rimavská Sobota","Veľký Krtíš","Zvolen","Žarnovica","Žiar nad Hronom");
var bratislava = new Array("Bratislava I","Bratislava II","Bratislava III","Bratislava IV","Bratislava V","Malacky","Pezinok","Senec");

var kosice = new Array("Gelnica","Košice I","Košice II","Košice II","Košice IV","Košice-okolie","Michalovce","Rožňava","Sobrance","Spišská Nová Ves","Trebišov");

var nitra = new Array("Komárno","Levice","Nitra","Nové Zámky","Šaľa","Topoľčany","Zlaté Moravce");

var presov = new Array("Bardejov","Humenné","Kežmarok","Levoča","Medzilaborce","Poprad","Prešov","Sabinov","Snina","Stará Ľubovňa","Stropkov","Svidník","Vranov nad Topľou");

var trencin = new Array("Bánovce nad Bebravou","Ilava","Myjava","Nové Mesto nad Váhom","Partizánske","Považská Bystrica","Prievidza","Púchav","Trenčín");

var trnava = new Array("Dunajská Streda","Galanta","Hlohovec","Piešťany","Senica","Skalica","Trnava");

var zilina = new Array("Bytča","Čadca","Dolný Kubín","Kysucké Nové Mesto","Liptovský Mikuláš","Martin","Námestovo","Ružomberok","Turčianske teplice","Tvrdošín","Žilina");

function set_player() {
  var select_country = document.myform.country;
  var select_player = document.myform.player;
  var selected_country = select_country.options[select_country.selectedIndex].value;

  select_player.options.length=0;
  if (selected_country == "Banskobystrický"){
    for(var i=0; i<banskabystrica.length; i++)
    select_player.options[select_player.options.length] = new Option(banskabystrica[i]);
  }
  if (selected_country == "Bratislavský"){
    for(var i=0; i<bratislava.length; i++)
    select_player.options[select_player.options.length] = new Option(bratislava[i]);
  }
  if (selected_country == "Košický"){
    for(var i=0; i<kosice.length; i++)
    select_player.options[select_player.options.length] = new Option(kosice[i]);
  }
  if (selected_country == "Nitriansky"){
    for(var i=0; i<nitra.length; i++)
    select_player.options[select_player.options.length] = new Option(nitra[i]);
  }
  if (selected_country == "Prešovský"){
    for(var i=0; i<presov.length; i++)
    select_player.options[select_player.options.length] = new Option(presov[i]);
  }
    if (selected_country == "Trenčiansky"){
    for(var i=0; i<trencin.length; i++)
    select_player.options[select_player.options.length] = new Option(trencin[i]);
  }
    if (selected_country == "Trnavský"){
    for(var i=0; i<trnava.length; i++)
    select_player.options[select_player.options.length] = new Option(trnava[i]);
  }
    if (selected_country == "Žilinský"){
    for(var i=0; i<zilina.length; i++)
    select_player.options[select_player.options.length] = new Option(zilina[i]);
  }
}

include "databaza.php";
session_start();
if($_SESSION['prihlaseny'] != 'ano')
   die("Nepovolený vstup! Najprv sa prihláste.");
$kraj = $_POST['country'];
$okres = $_POST["okres"];

$oprava = "UPDATE uzivatelia SET
            kraj = '$kraj',
            mesto = '$okres'
            WHERE email = '".$_SESSION['email']."'";


$dooprava = mysql_query($oprava, $link) or die ("Update sa nepodaril.");
echo " Uložené";

<select name="player" id="okres">

<select name="okres" id="okres">