problem with firefox to parse the xml file using google map api

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how to parse xml file using google map api

I have the following code which returns xml output sucessfully but their is problem with parsing xml and displaying output on the map.when i look the request and response output on firebug i am sucessfully getting xml file but problem with parsing that particular file using google map api .

function searchLocationsNear() {
            var radius = document.getElementById('radiusSelect').value;

            var searchUrl = "http://localhost:1894/blockseek8-9-2010/Block3.xml"; //reference for xml file stored in application folder
            GDownloadUrl(searchUrl, function(data) {
                var xml = GXml.parse(data);
                var markers = xml.documentElement.getElementsByTagName('marker');
                map.clearOverlays();

                var sidebar = document.getElementById('sidebar');
                sidebar.innerHTML = '';
                alert(markers.length);

                if (markers.length == 0) {
                    sidebar.innerHTML = 'No results found.';
                    map.setCenter(new GLatLng(40, -100), 4);
                    return;
                }

                var bounds = new GLatLngBounds();
                for (var i = 0; i < markers.length; i++) {
                    var name = markers[i].getAttribute('name');
                    var address = markers[i].getAttribute('address');
                    var distance = parseFloat(markers[i].getAttribute('distance'));
                    var point = new GLatLng(parseFloat(markers[i]
                    .getAttribute('lat')), parseFloat(markers[i]
                    .getAttribute('lng')));
                    var imagepath = markers[i].getAttribute('imagepath');

                    var marker = createMarker(point, name, address, imagepath);
                    map.addOverlay(marker);
                    var sidebarEntry = createSidebarEntry(marker, name, address,
                    distance, imagepath);
                    sidebar.appendChild(sidebarEntry);


                    bounds.extend(point);
                }
                map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds));
            });
        }