var map;
var geoXml; 

function initialize(lat,lon,zoom) {
  if (GBrowserIsCompatible()) {
    geoXml = new GGeoXml("http://casastristes.org/externalmap/nodes.php");
    //geoXml = new GGeoXml("http://go.yuri.at/jsmap/nodes.php");
    //geoXml = new GGeoXml("http://casastristes.org/es/kml/node/nodes.kml");
    map = new GMap2(document.getElementById("map_canvas")); 
    map.setCenter(new GLatLng(lat,lon), zoom); 
    map.addControl(new GLargeMapControl());
    map.addControl(new GLargeMapControl());
    map.addOverlay(geoXml);
  }
}