/* script for dynamic changes in listboxes */
var hotels = {
   "Mariánské Lázně" : [ "Spa Hotel Nové Lázně", "Spa Hotel Staré Lázně", "Spa Hotel Hvězda-Skalník", "Wellness Hotel Villa Butterfly", "Grandhotel Pacifik" ],
   "Karlovy Vary" : [ "Parkhotel Richmond" ],
   "Třeboň" : [ "subitem 4" ]
};

var rooms = {
   "Spa Hotel Nové Lázně" : [ "single room superior", "double room superior" ],
   "Spa Hotel Staré Lázně" : [ "Parkhotel Richmond" ],
   "Spa Hotel Hvězda-Skalník" : [ "subitem 4" ]
};

function lstCities_OnChange() {
  var listBox = document.getElementById("lstCities");
  var subListBox = document.getElementById("lstHotels");
  subListBox.options.length=1;
  for(i=0; i<listBox.length; i++) {
    if( listBox.options[i].selected ) {
      var key = listBox.options[i].text;
      if(hotels[key]) {
        for(j=0; j<hotels[key].length; j++) {
        subListBox.options.add(new Option(hotels[key][j],hotels[key][j]));
        }
      }
    }
  }
}