function LoadGoogleMapData(map, dataPathMarker,dataPathCourse, clearOverlays) {
    if (clearOverlays) map.clearOverlays();

    LoadMarkersIntoMap(map, dataPathMarker);
    LoadPolylineIntoMap(map, dataPathCourse);

    var hasLoaded = map.isLoaded();
}

function LoadMarkersIntoMap(map, url) {
    GDownloadUrl(url, function(data, responseCode) {
        var xml = GXml.parse(data);

        if (!xml.documentElement) return;

        var markers = xml.documentElement.getElementsByTagName("marker");
        for (var i = 0; i < markers.length; i++) {

            var point = new GLatLng(parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng")));
            var markerOptions = CreateMarkerOptions(markers[i]);
            var marker = new GMarker(point, markerOptions);

            var info = markers[i].getAttribute("info");

            if (info) {

                var reOpen = /{{/g;
                var reClose = /}}/g;
                var infoHtml = info.replace(reOpen, "<").replace(reClose, ">");

                marker.content = infoHtml;


                CreateMarkerClick(marker, infoHtml);
            }

            map.addOverlay(marker);
        }
    });

}

function LoadGoogleMapData( map, dataPath, clearOverlays)
{
    if ( clearOverlays )map.clearOverlays();
    
//    LoadMarkersIntoMap( map, dataPath + "marker.xml");
    //    LoadPolylineIntoMap( map, dataPath + "course.xml" );
    LoadMarkersIntoMap(map, dataPath);
    LoadPolylineIntoMap(map, dataPath);
    
   var hasLoaded = map.isLoaded();


}

function LoadPolylineIntoMap(map, url, color, width, opacity) {


    if (!color) color = '#ff0000';

    if (!width) width = 6;

    if (!opacity) opacity = 1.0;


    GDownloadUrl(url, function(data, responseCode) {

        var xml = GXml.parse(data);


        if (!xml.documentElement) return;


        var polylines = xml.documentElement.getElementsByTagName("polyline");

        var centrePoint;


        for (var l = 0; l < polylines.length; l++) {


            lineColor = polylines[l].getAttribute("color");

            lineWidth = parseInt(polylines[l].getAttribute("width"));

            lineOpacity = parseFloat(polylines[l].getAttribute("opacity"));


            if (!lineColor) lineColor = color;

            if (!lineWidth) lineWidth = width;

            if (!lineOpacity) lineOpacity = opacity;


            var points = polylines[l].getElementsByTagName("point");

            var pointArray = [];




            for (var p = 0; p < points.length; p++) {

                var point = new GLatLng(parseFloat(points[p].getAttribute("lat")), parseFloat(points[p].getAttribute("lng")));

                pointArray.push(point);


                if (p == 0) {

                    centrePoint = point

                }

            }


            var polyline = new GPolyline(pointArray, lineColor, lineWidth, lineOpacity);

            //map.addOverlay( polyline ); 

            AddOverlay(map, polyline);


            map.panTo(centrePoint);

        }


    });


}