google maps cluster marker xml problem

[hammelta]

how to build a cluster marker? the data comes on the fly as xml
'phpsqlajax_genxml3.php'. i add the these lines

markers.push(marker);
}
var markerCluster = new MarkerClusterer(map, markers);


but nothing happend.


need helf for this result
http://gmaps-utility-library.googlecode.com/svn/trunk/markerclusterer/1.0/examples/simple_example.html

or

http://gmaps-utility-library.googlecode.com/svn/trunk/markerclusterer/1.0/examples/advanced_example.html
-------------------------------------------------

    var iconBlue = new GIcon();
    iconBlue.image = 'http://labs.google.com/ridefinder/images/
mm_20_blue.png';
    //iconBlue.shadow = 'http://labs.google.com/ridefinder/images/
mm_20_shadow.png';
    iconBlue.iconSize = new GSize(12, 20);
    iconBlue.shadowSize = new GSize(22, 20);
    iconBlue.iconAnchor = new GPoint(6, 20);
    iconBlue.infoWindowAnchor = new GPoint(5, 1);

    var iconRed = new GIcon();
    //iconRed.image = 'http://labs.google.com/ridefinder/images/
mm_20_red.png';
    iconRed.image = 'bullet_red-16x16.png';
    //iconRed.shadow = 'http://labs.google.com/ridefinder/images/
mm_20_shadow.png';
    iconRed.iconSize = new GSize(16, 16);
    //iconRed.shadowSize = new GSize(22, 20);
    iconRed.iconAnchor = new GPoint(6, 20);
    iconRed.infoWindowAnchor = new GPoint(5, 1);

    var customIcons = [];
    customIcons["restaurant"] = iconBlue;
    customIcons["bar"] = iconRed;

    function load() {
      if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map"));
        map.addControl(new GLargeMapControl());
        map.addControl(new GMapTypeControl());
        map.setCenter(new GLatLng(50.972264, 9.788818), 6,
G_NORMAL_MAP);


        // Change this depending on the name of your PHP file
        GDownloadUrl("phpsqlajax_genxml3.php", function(data) {
          var xml = GXml.parse(data);
          var markers =
xml.documentElement.getElementsByTagName("marker");
          for (var i = 0; i < markers.length; i++) {
            var address = markers[i].getAttribute("address");
            var point = new
GLatLng(parseFloat(markers[i].getAttribute("lat")),
 
parseFloat(markers[i].getAttribute("lng")));
            var marker = createMarker(point, address);
            //map.addOverlay(marker);
            markers.push(marker);
          }

          var markerCluster = new MarkerClusterer(map, markers);

        });
      }
    }

    function createMarker(point, address) {
      var marker = new GMarker(point, iconRed);
      /*
      var html = "<b>" + address + "</b>"; //extra herausgenommen,
hier können sämtliche daten hinterlegt werden
      GEvent.addListener(marker, 'click', function() {
        marker.openInfoWindowHtml(html);
      });
      */
      return marker;
    }

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