var pocetSekci = 10; // pocet sekci celkove
var nazevStylu = 'MenuSection';
var nazevCookie = 'actSection';

var today = new Date();
var expiry = new Date(today.getTime() + 365 * 24 * 60 * 60 * 1000);

function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1) { endstr = document.cookie.length; }
  return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg) {
      return getCookieVal (j);
      }
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break; 
    }
  return null;
}

function DeleteCookie (name,path,domain) {
  if (GetCookie(name)) {
    document.cookie = name + "=" +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}

function SetCookie (name,value,expires,path,domain,secure) {
  document.cookie = name + "=" +  (value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

function doSection(zmenitSekci){
   var sekce = 1;
   
   if (zmenitSekci == 0) {DeleteCookie(nazevCookie, '/');}
   for (sekce=1; sekce<=pocetSekci; sekce++)
   {
       nazev = nazevStylu + sekce;
       if (!document.getElementById(nazev)) {continue}
              
       if (sekce == zmenitSekci) {
          // skryje sekci je-li zobrazena a naopak
          if (document.getElementById(nazev).className=="menu-left-submenu-off"){
             document.getElementById(nazev).className="menu-left-submenu";
             DeleteCookie(nazevCookie, '/');
             SetCookie(nazevCookie, sekce, null, '/');
          } else {
             document.getElementById(nazev).className="menu-left-submenu-off";
             DeleteCookie(nazevCookie, '/');
          }
       } else {
         // skryje sekci
         document.getElementById(nazev).className="menu-left-submenu-off";
       }
   }
}

function closeSections() {
  for (sekce=1; sekce<=pocetSekci; sekce++)
   {
      nazev = nazevStylu + sekce;
      if (!document.getElementById(nazev)) {continue}
      document.getElementById(nazev).className="menu-left-submenu-off";
   }
}

function refreshSection() {

   closeSections();
   if (GetCookie(nazevCookie) == null) {
   } else {
      var actSec = GetCookie(nazevCookie);
      doSection(actSec);
   }
}