function RoutePopup(pcstring, straat, plaats, land) 
{
  // open the popup window
  var popupURL = "http://tools.locatienet.com/location/map.asp?config_id=4778&language=dutch&zipcode="+pcstring+"&street="+straat+"&city="+plaats+"&country="+land+"&zoom=4&markertext=midden van postcodegebied van gevraagde locatie&logo=http://www.airtoi.nl/logos/airtoi170.gif&css=http://www.airtoi.nl/airtoinl.css&returntext=venster sluiten&returnurl=javascript: close()";
    var popup = window.open(popupURL,"Routeplanner",'resizable=0,location=0,width=620,height=450');
  // set the opener if it's not already set.  it's set automatically
  // in netscape 3.0+ and ie 3.0+.
  if( navigator.appName.substring(0,8) == "Netscape" ) {popup.location = popupURL; popup.focus(); }
}