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    var latNorth = boundNorthEast.lat();
    var lngEast  = boundNorthEast.lng();
    var latSouth = boundSouthWest.lat();
    var lngWest  = boundSouthWest.lng();

    var lngMid   = (lngWest < lngEast) ? lngWest + (lngEast - lngWest) / 2
                                       : lngWest + ((lngEast - (-180)) + (180 - lngWest)) / 2;
    if (lngMid > 180) { // Longitude +180 continues with -180
        lngMid = -180 + (lngMid - 180); // (lngMid - 180) is overflow over 180'
    }

    // Longitude +180 continues with -180
    tileSideLng = (lngWest < lngEast) ? (lngEast - lngWest) / numberOfHorizontalTiles              
                                      : ((lngEast - (-180)) + (180 - lngWest)) / numberOfHorizontalTiles;

    tileSideLat = (latNorth - latSouth) / numberOfVerticalTiles;

//  document.getElementById("debug").innerHTML =   '> latNorth:' + latNorth
//                                               + ' latSouth:' + latSouth
//                                               + '<br>'
//                                               + ' lngWest:'  + lngWest
//                                               + ' lngEast:'  + lngEast
//                                               + ' tileSideLng:'  + tileSideLng
//                                               + '<br/>';

    for (var n = 1; n < numberOfHorizontalTiles; n++) {
        // Draw longitudes
        var lngNth = lngWest + n * tileSideLng;

        if (lngNth > 180) { // Longitude +180 continues with -180
            lngNth = -180 + (lngNth - 180); // (lngNth - 180) is overflow over 180'
        }

        var polyline = new GPolyline([
            new GLatLng(latNorth, lngNth),
            new GLatLng(latSouth, lngNth)
            ], "#ff8b04", 2);
        map.addOverlay(polyline);
        map.addOverlay(polyline); // Every other polyline is skipped, a potential bug; observe 8/10/07        
    }   

    for (var n = 1; n < numberOfVerticalTiles; n++) {
        // Draw latitudes
        var latNth = latSouth + n * tileSideLat;

        var polyline = new GPolyline([
            new GLatLng(latNth, lngWest),
            new GLatLng(latNth, lngMid),   // A mid point is needed to ensure direction of the line is correct
            new GLatLng(latNth, lngEast)
            ], "#ff8b04", 2);
        map.addOverlay(polyline);
        map.addOverlay(polyline); // Every other polyline is skipped, a potential bug; observe 8/10/07       
    }

// document.getElementById("debug").innerHTML = 'zoom:' + map.getZoom();

    return 1;
}

// Start refresh (clear overlays and messages)
function startRefresh() {
    // Clear existing overlays
    map.clearOverlays();

    document.getElementById("status").innerHTML         = 'Moving ...';
    document.getElementById("legend").innerHTML         = '';
    document.getElementById("legend_message").innerHTML = '';
    document.getElementById("details").innerHTML        = '';
}

// Refresh display (clear overlays, send an AJAX request, process request)
function doRefresh(event) {
    var drawGrid = varStore.drawGrid;

    // Clear existing overlays
    map.clearOverlays();

    document.getElementById("status").innerHTML = "Refreshing ...";

    // Construct URL based on coordinates and form values
    var requestUrl = constructUrl();

    // Query database, pass results on for parsing
    GDownloadUrl(requestUrl, processRequest); // No parentheses

    // Draw grid
    if (drawGrid > 0) {
        addLatLngLines();
    }    
}

// Place markers on the map
function processRequest(data, responseCode) {
    var xml = GXml.parse(data);

    var markers = xml.documentElement.getElementsByTagName("marker");

    for (var i = 0; i < markers.length; i++) {
        var lat = parseFloat(markers[i].getAttribute("latitude"));
        var lng = parseFloat(markers[i].getAttribute("longitude"));

        var iconUrl         = markers[i].getAttribute("icon_url");
        var iconSize        = markers[i].getAttribute("icon_size");
        var messagesOnClick = markers[i].getAttribute("messages_on_click");
        var detailsOnClick  = markers[i].getAttribute("details_on_click");
        var legendOnClick   = markers[i].getAttribute("legend_on_click");

        var point = new GLatLng(lat, lng);

        addMarker(point, iconUrl, iconSize, legendOnClick, detailsOnClick, messagesOnClick);

        document.getElementById("details").innerHTML = '[Click on an icon on the map for details ...]';
    }

    var metaData = xml.documentElement.getElementsByTagName("meta_data"); // Only one present

    var legendByDefault   = metaData[0].getAttribute("legend_by_default");
    var detailsByDefault  = metaData[0].getAttribute("details_by_default")
    var messagesByDefault = metaData[0].getAttribute("messages_by_default")

    if (legendByDefault) {
        document.getElementById("legend").innerHTML = legendByDefault;
    }

    if (detailsByDefault) {
        document.getElementById("details").innerHTML = detailsByDefault;
    }

    if (messagesByDefault) {
        document.getElementById("messages").innerHTML = messagesByDefault;
    }

document.getElementById("status").innerHTML = "Ready";
}