var xmlHttp_koordinatem = null;

function gauti_koordinates()
{
  xmlHttp_koordinatem = GetXmlHttpObject();
  var url = "return.php?type=koord";
  var method = "get";
  var data = null;  
  var mastelis = null;

  mastelis = document.getElementById("mastelis").value;
  if (null != mastelis)
    url+= "&mastelis=" + mastelis;

  xmlHttp_koordinatem.onreadystatechange = koordinates;
  xmlHttp_koordinatem.open(method, url, true);
  xmlHttp_koordinatem.send(data);  
}

function koordinates()
{
  if ((xmlHttp_koordinatem.readyState == 4)&&(xmlHttp_koordinatem.status == 200)) 
  {
    var xmlDoc = xmlHttp_koordinatem.responseXML;
    options = xmlDoc.getElementsByTagName("OPTION");
    document.getElementById("koord_sis").innerHTML = "";
    for (var i = 0; i < xmlDoc.getElementsByTagName("OPTION").length; i++)
    {
      var option = document.createElement("option");
      option.setAttribute("value", options[i].getAttribute('id'));
      option.innerHTML = options[i].childNodes[0].nodeValue;
      document.getElementById("koord_sis").appendChild(option);
    }
  }
}