function nacist(co)
{
     var url = co;
     if (url != 0)
     {
        if (window.ActiveXObject)
        {
          httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
        }
        else
        {
          httpRequest = new XMLHttpRequest(); 
        }
        httpRequest.open("GET", url, true);
        httpRequest.onreadystatechange= function () {zamenit(); } ;
        httpRequest.send(null);
      }
      else
      {
        document.getElementById("kalendar").innerHTML = "Chyba";
      }
}

function zamenit()
{
  if (httpRequest.readyState == 4)
  {
    if(httpRequest.status == 200)
    {
      var mistoZobrazeni = document.getElementById("kalendar");
      mistoZobrazeni.innerHTML = httpRequest.responseText;
    }
    else
    {
        alert("Chyba pri nacitani kalendare"+ httpRequest.status +":"+ httpRequest.statusText);
    }
  }
}