if (GBrowserIsCompatible()) {
      var side_bar_html = "";
      var gmarkers = [];
      var htmls = [];
      var i = 0;
      function createMarker(point,name,html) {
        var marker = new GMarker(point);
        GEvent.addListener(marker, "click", function() {
          marker.openInfoWindowHtml('<div style="width:240px;padding-bottom:6px;">'+html+'</div>');
        });
        gmarkers[i] = marker;
        htmls[i] = html;
        side_bar_html += '<a href="javascript:myclick(' + i + ')">' + name + '</a><br>';
        i++;
        return marker;
      }

      function myclick(i) {
        gmarkers[i].openInfoWindowHtml('<div style="width:240px;padding-bottom:6px;">'+htmls[i]+'</div>');
            this.scrollTo(0,0);
      }

      var map = new GMap2(document.getElementById("map"));
      map.addControl(new GLargeMapControl());
      map.addControl(new GMapTypeControl());
      map.setCenter(new GLatLng(51.107885,17.038538), 12);


      // Read the data from data.xml
      var request = GXmlHttp.create();
      request.open("GET", "data.xml", true);
      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          var xmlDoc = GXml.parse(request.responseText);
          var markers = xmlDoc.documentElement.getElementsByTagName("marker");
          for (var i = 0; i < markers.length; i++) {
            var lat = parseFloat(markers[i].getAttribute("lat"));
            var lng = parseFloat(markers[i].getAttribute("lng"));
            var point = new GLatLng(lat,lng);
            var html = markers[i].getAttribute("html");
            var label = markers[i].getAttribute("label");
            var marker = createMarker(point,label,html);
            map.addOverlay(marker);
          }
          document.getElementById("map_menu").innerHTML = side_bar_html;
        }
      }
      request.send(null);
    }
    else {
      alert("Google Maps nie współpracuje z Twoją przegladarką.");
    }