var xmlhttp;

function posun_kalendar(oco)
{
  xmlhttp=GetXmlHttpObject();
  if (xmlhttp==null){alert ("Your browser does not support XMLHTTP!");return;}
  var url="posun_kalendar.php";
  var cas=new Date(); 
  url=url+"?sid="+cas.getTime();
  url=url+"&zcoho="+document.getElementById('kalendar_pozicia').value;
  url=url+"&oco="+oco;
  xmlhttp.onreadystatechange=stateChanged;
  xmlhttp.open("GET",url,true);
  xmlhttp.send(null);
}

function stateChanged()
{
  if (xmlhttp.readyState==4)
  {
    document.getElementById('kalendardiv').innerHTML=xmlhttp.responseText;
  }
}

function GetXmlHttpObject()
{
  if (window.XMLHttpRequest)
  {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    return new XMLHttpRequest();
  }
  else if (window.ActiveXObject)
  {
    // code for IE6, IE5
    return new ActiveXObject("Microsoft.XMLHTTP");
  }
  else
  {
    return null;
  }
}