var url = "/website/uitgebreid_zoeken_get.php?param=";
var isWorking = false;

function handleHttpResponse() {
  if (http.readyState == 4) {
    if (http.responseText.indexOf('invalid') == -1) {
      var xmlDocument 	= http.responseXML; 
	  var xmlTag_id   	= xmlDocument.getElementsByTagName('id');
	  var selectObject	= document.getElementById('txtPlaatsen');
	  for(var i=0; i<xmlTag_id.length;i++){
    	var optionObject = new Option(xmlDocument.getElementsByTagName('naam').item(i).firstChild.data, 
									  xmlDocument.getElementsByTagName('id').item(i).firstChild.data);
    	var optionRank   = selectObject.options.length;
    	selectObject.options[optionRank]=optionObject;
	  }	  
      isWorking = false;
    }
  }
}

function updatePlaces() {
  var selectObject = document.getElementById('txtPlaatsen');
  selectObject.options.length = 0;  
  if (!isWorking && http) {
    var edValue = document.getElementById("editie").value;
    http.open("GET", url + escape(edValue), true);
    http.onreadystatechange = handleHttpResponse;
    isWorking = true;
    http.send(null);
  }
}

function getHTTPObject() {
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}
var http = getHTTPObject(); // We create the HTTP Object<script language="javascript"  type="text/javascript">