function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function ChangeOnSubject(type) {

  if ( type == "jiny" )
  {
    document.getElementById("jsJinyduvod").style.display="block"; 
  }
  else
  {
    document.getElementById("jsJinyduvod").style.display="none";   
  }

}

function CheckForm() {

  if ( document.getElementById("jsTextArea").value == "" ) 
  {
    alert('Vyplňte prosím zprávu!')  
    return false;
  }
  else
  {
    return true;
  }
}

function TextAreaReset(name, submitbutton) { //vymaze texarea a aktivuje odesilaci tlacitko
  if (document.getElementById(submitbutton).disabled==true)
  {
   document.getElementById(name).value = "";
   document.getElementById(submitbutton).disabled=false;   
  }
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
  
  document.getElementById("jsJinyduvod").style.display="none";
  document.getElementById("jsSubmit").disabled=true;
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);



function ShowPicture(nazev, pict)
{
  var url = "gallery.php?obr=" + pict + "&nazev=" + nazev;
  window.open(url,"blank","toolbar=no, width=610, height=600, scrollbars, resizable");
}