function lookupPostcode(aPostcodeName,aStreetName,aPlaceName,aCountryName)
{
  objHTTP = GetHttpObject();
  if (objHTTP == null) return false;

  var postcode = document.getElementById(aPostcodeName).value;
  var country = document.getElementById(aCountryName).value;
  objHTTP.open("POST",jul_baseurl+"ajax/postcode.php",false);
  objHTTP.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  var data = "postcodeNaam="+aPostcodeName+"&straatNaam="+aStreetName+"&woonplaatsNaam="+aPlaceName+"&landcode="+country+"&postcode="+postcode;
  objHTTP.send(data);
  result = objHTTP.responseText;
  //alert(result);
  eval(result);
  return false;
}