gistfile1.txt

tilelayer.getTileUrl = function(tile,zoom) {
    if ((zoom < mapMinZoom) || (zoom > mapMaxZoom)) {
        return "http://www.maptiler.org/img/none.png";
    } 
    var ymax = 1 << zoom;
    var y = ymax - tile.y -1;
    var tileBounds = new GLatLngBounds(
        mercator.fromPixelToLatLng( new GPoint( (tile.x)*256, (tile.y+1)*256 ) , zoom ),
        mercator.fromPixelToLatLng( new GPoint( (tile.x+1)*256, (tile.y)*256 ) , zoom )
    );
    if (mapBounds.intersects(tileBounds)) {
        return zoom+"/"+tile.x+"/"+y+".jpg";
    } else {
        return "http://www.maptiler.org/img/none.png";
    }
}