def monkey_patch_tiles(mpltiles):
    """Add some new tiles to the mplleaflet."""
    mpltiles['norgeskart_topo4'] = (
        'http://opencache.statkart.no/gatekeeper/gk/gk.open_gmaps?layers=topo4&zoom={z}&x={x}&y={y}'
        , '<a href="http://www.kartverket.no">Kartverket</a>')
    mpltiles['norgeskart_toporaster3'] = (
        'http://opencache.statkart.no/gatekeeper/gk/gk.open_gmaps?layers=toporaster3&zoom={z}&x={x}&y={y}'
        , '<a href="http://www.kartverket.no">Kartverket</a>')
