function initialize() {
	
	var map = new GMap2(document.getElementById("map_canvas"));
	map.addControl(new GSmallMapControl());
	map.addControl(new GMapTypeControl());
	map.setCenter(new GLatLng(51.500721, 0.112596), 14);
		var point = new GLatLng(51.500721,-0.112596);
		map.addOverlay(new GMarker(point));
    if (GBrowserIsCompatible()) {
        map.setCenter(new GLatLng(51.500721,-0.112596), 14);
        GEvent.addListener(map,"click", function(overlay,latlng) {     
          if (latlng) {   
            var myHtml = "The GLatLng value is: " + map.fromLatLngToDivPixel(latlng) + " at zoom level " + map.getZoom();
            map.openInfoWindow(latlng, myHtml);
          }
        });
   }
}