//inicializace menu
$(document).ready(function(){
 $("ul.dropdown li").hover(function(){
   $(this).addClass("hover");
   $('> .dir',this).addClass("open");
   $('ul:first',this).css('visibility', 'visible');
 },function(){
   $(this).removeClass("hover");
   $('.open',this).removeClass("open");
   $('ul:first',this).css('visibility', 'hidden');
 });
 
});

/* AJAX */
var xmlhttp;
function AJAX_object() {
  if (window.XMLHttpRequest)
    {
      return new XMLHttpRequest();
     }
  else if (window.ActiveXObject)
    {
      return new ActiveXObject("Microsoft.XMLHTTP");
    }
  return null;
}

function AJAX_html(url, div) {
  xmlhttp = AJAX_object();
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4){
        document.getElementById(div).innerHTML = xmlhttp.responseText;
    }
    else {
      document.getElementById(div).innerHTML = "<img src='img/loadingAnimation.gif' alt='Cekejte, prosim'> Nahrávám, čekejte, prosím";
    }
  }
  xmlhttp.open("GET",url,true);
  xmlhttp.send(null);
}