// Obecne funkce
var isDOM = (document.getElementById ? true : false); 
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);
function getRef(id) {
  if (isDOM) return document.getElementById(id);
  if (isIE4) return document.all[id];
  if (isNS4) return document.layers[id];
}
function getSty(id) {
  return (isNS4 ? getRef(id) : getRef(id).style);
}
// Kontrola dotazu pro hledani
function checkQuery() {
  var form = document._QuickSearchForm;
  var len = form.Query.value.length;
  if(len == 0) {
//    alert("Query is empty!");
    form.Query.focus();
    return false;
  }
  
  return true;
}
// Prehazovani menu
var lastmnu = 0;
function menuswap(idx)
{
  var sub_last = getSty("submenu" + lastmnu);
  var sub_cur = getSty("submenu" + idx);
  sub_last.display = "none";
  sub_cur.display = "block";
  lastmnu = idx;
}
// Cyklovani obrazku
var obr = new Array();
var pocetobr;
var aktobr;
var dalsi;
var mincas = 5;
var rozptyl = 2;
var IE4 = parseInt(navigator.appVersion)>=4 && navigator.appName == "Microsoft Internet Explorer";
var ds = 1;
// window.onload = StartTrans;
function StartTrans()
{
  obr[0] = new Image();
  obr[0].src = "/AIS/web-en.nsf/pic03.jpg";
  obr[1] = new Image();
  obr[1].src = "/AIS/web-en.nsf/pic05.jpg";
  obr[2] = new Image();
  obr[2].src = "/AIS/web-en.nsf/pic06.jpg";
  obr[3] = new Image();
  obr[3].src = "/AIS/web-en.nsf/pic07.jpg";
  pocetobr = obr.length;
  aktobr = pocetobr - 1;
  dalsi = (Math.random()*rozptyl+mincas)*1000;
  window.setTimeout ("Trans()", dalsi);
}
function Trans()
{
  aktobr++;
  if (aktobr==pocetobr) aktobr = 0;
  if (IE4) uvodobr.filters[0].Apply();
  window.document.images["uvodobr"].src = obr[aktobr].src;
  if (IE4) uvodobr.filters[0].Play();
  
  dalsi = (Math.random()*rozptyl+mincas)*1000;
  window.setTimeout ("Trans()", dalsi);
}