// ulozeni cookie
function setCookie(name, value, expires, path, domain, secure) {
  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires.toGMTString() : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");
  document.cookie = curCookie;
}
// precteni cookie
function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

//oprava data
function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0)
    date.setTime(date.getTime() - skew);
}

/*funkce vlozi id do cokies, pokud jsou ulozeny vic nez 4 polozku k porovnani, zobrazi hlaseni 
o max mnozstvi polozek
pokud neni stejne zid, zobrazi hlaseni o moznosti porovnavat pouze stejne kategorie */

function vloz(id,kid) {
  
  var p_kid=new Array();
  var p_zid=new Array();
  for (i=0;i<=3;i++){
    if (getCookie('p_kid['+i+']')){
       
       p_kid[i]=getCookie('p_kid['+i+']');
       p_zid[i]=getCookie('p_zid['+i+']');
    }
    if (p_zid[i]==id) {
      smaz(id,i);
      return;
    }
  }
  if (p_kid[0]!=kid && p_kid[0]) {
    alert('Ľutujeme, ale porovnávať je možné len výrobky rovnakej kategórie. \nVyberte iný tovar alebo odstráňte už vybrané.');
    return;
  }
  if (p_zid.length==4) {
    alert('Ľutujeme, ale porovnávať môžete najviac 4 kusy výrobkov.');
    return;
  }
  var now = new Date();
  fixDate(now);
  now.setTime(now.getTime() + 60 * 60 * 1000);
  setCookie('p_zid['+p_zid.length+']', id, now,'/');
  setCookie('p_kid['+p_zid.length+']', kid, now, '/');
  if (!getCookie('p_zid['+p_zid.length+']')) alert ('Pre porovnávanie výrobkov musí Váš prehliadač podporovať cookies');
  else {

              
    document.getElementById("p_ovladani").style.display = "inline";
  }
  
}

// smaze vsechny ulozene polozky k vyhledavani
function smaz_vse() {
  var path="/";
  var domain;
  for (i=0;i<=3;i++){
    if (id=getCookie('p_zid['+i+']')){
     if (document.getElementById(id)) {

             
  }
      document.cookie = "p_kid["+i+"]" + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  
      document.cookie = "p_zid["+i+"]" + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
  }
   document.getElementById("p_ovladani").style.display = "none";
}

function smaz(id,i) {
  var path="/";
  var domain;
  pom=0;
  for (j=i+1;j<=4;j++){
  
  if (!getCookie('p_zid['+j+']')){
  
  document.cookie = "p_kid["+(j-1)+"]" + "=" +
  ((path) ? "; path=" + path : "") +
  ((domain) ? "; domain=" + domain : "") +
  "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  
  document.cookie = "p_zid["+(j-1)+"]" + "=" +
  ((path) ? "; path=" + path : "") +
  ((domain) ? "; domain=" + domain : "") +
  "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
  else{
  pom=1;
  var now = new Date();
  fixDate(now);
  now.setTime(now.getTime() + 60 * 60 * 1000);
   setCookie('p_zid['+(j-1)+']', getCookie('p_zid['+j+']'), now,'/');
   setCookie('p_kid['+(j-1)+']', getCookie('p_kid['+j+']'), now, '/');
  
  document.cookie = "p_kid["+j+"]" + "=" +
  ((path) ? "; path=" + path : "") +
  ((domain) ? "; domain=" + domain : "") +
  "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  
  document.cookie = "p_zid["+j+"]" + "=" +
  ((path) ? "; path=" + path : "") +
  ((domain) ? "; domain=" + domain : "") +
  "; expires=Thu, 01-Jan-70 00:00:01 GMT";
   
  }
  
  }
  if (document.getElementById(id)) {

              
  }
  
  if (pom==0 && i==0) document.getElementById("p_ovladani").style.display = "none";
    
}


function smaz2(id) {
       var path="/";
        var domain;
 for (i=0;i<=3;i++){
   if (getCookie('p_zid['+i+']')==id){
   
     for (j=i+1;j<=4;j++){
  
       if (!getCookie('p_zid['+j+']')){
        
        document.cookie = "p_kid["+(j-1)+"]" + "=" +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  
        document.cookie = "p_zid["+(j-1)+"]" + "=" +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        "; expires=Thu, 01-Jan-70 00:00:01 GMT";
      }
      else{
        var now = new Date();
        fixDate(now);
        now.setTime(now.getTime() + 60 * 60 * 1000);
        setCookie('p_zid['+(j-1)+']', getCookie('p_zid['+j+']'), now,'/');
        setCookie('p_kid['+(j-1)+']', getCookie('p_kid['+j+']'), now, '/');
  
        document.cookie = "p_kid["+j+"]" + "=" +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  
        document.cookie = "p_zid["+j+"]" + "=" +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        "; expires=Thu, 01-Jan-70 00:00:01 GMT";
       }
      }
    }
  
  }
  
  
}
/**********************************************************
* Po nacteni stranky zameni obrazky zvolenych polozek 
**********************************************************/
function nastav_obrazky() {
  var pom=0;
  
  for (i=0;i<=3;i++){
      
    if (id=getCookie('p_zid['+i+']')){
      pom=1;
      if (document.getElementById(id)){ 

      
              }
    }
  }
  if (pom==1){
      if (document.getElementById("p_ovladani")){
     document.getElementById("p_ovladani").style.display = "inline";
     }
  }
}