function initialize_ymap()
        {
            // Create a map object
            var map = new YMap(document.getElementById('ymap'));
          // Create a new marker for an address
          var myMarker = new YMarker("rue des Marchais La Pironniere 85180 LE CHATEAU D'OLONNE");
          // Create some content to go inside the SmartWindow
          var myMarkerContent = "<p class=nomCarte>Arena Camping**</p><p>Quartier Acotz<br />Avenue Napol&eacute;on III<br />64500 Saint-Jean-de-Luz<br />Pays Basque, Aquitaine</p>";
          // Create latitude/longitude point
          var yPoint = new YGeoPoint(43.4159, -1.624792);
          // Create a new marker for an address
          var myMarker = new YMarker(yPoint);
            // Display the map centered on a geocoded location
            map.drawZoomAndCenter(yPoint, 6);
            // Add map type control  
      map.addTypeControl();  
      // Add zoom control
          map.addZoomLong();
          // Add the pan control
          map.addPanControl();
          // Add a label to the marker
          myMarker.addAutoExpand("Arena Camping**");    
          // When the marker is clicked, show the SmartWindow
          YEvent.Capture(myMarker, EventsList.MouseClick,
            function() {
                myMarker.openSmartWindow(myMarkerContent); 
            });
          // Put the marker on the map
          map.addOverlay(myMarker);
        }