function SetMaker(p, s, nNo) {
    if (p.length) {
        IconData.iconUrl = 'https://www.kiilife.jp/image/osm/red-' + nNo + '.png';
        var marker = L.marker(p, { icon: L.icon(IconData) });
        marker.bindPopup(s);
        markers.addLayer(marker);
        if (bounds) {
            bounds.extend(p);
        } else {
            bounds = L.latLngBounds(p);
            bounds.extend(p);
        }
    }
}
// create a map in the "map" div, set the view to a given place and zoom
var bounds;

var map = L.map('map', {
    scrollWheelZoom: false
});
var IconData = {
    iconSize: [24, 42],
    iconAnchor: [12, 42],
    popupAnchor: [-0, -40],
    shadowUrl: 'https://www.kiilife.jp/image/osm/marker-shadow.png',
    shadowSize: [40, 40],
    shadowAnchor: [10, 40]
};
var markers = L.markerClusterGroup();
var zoom = 0;

// add a marker in the given location, attach some popup content to it and open the popup
SetMaker([33.73308411862553, 135.38413524627688], '<a href="//www.kiilife.jp/opendata/map/?id=59" class="iframe">JR紀伊田辺駅</a>', 1);
SetMaker([33.78057414624016, 135.27929306030276], '<a href="//www.kiilife.jp/opendata/map/?id=4508" class="iframe">JR岩代駅</a>', 2);
SetMaker([33.7806811564035, 135.27740478515625], '<a href="//www.kiilife.jp/opendata/map/?id=4573" class="iframe">岩代王子</a>', 3);
SetMaker([33.770247, 135.32018790000006], '<a href="//www.kiilife.jp/opendata/map/?id=4577" class="iframe">三鍋王子</a>', 4);
SetMaker([33.767517903241945, 135.32435417175296], '<a href="//www.kiilife.jp/opendata/map/?id=4510" class="iframe">JR南部駅</a>', 5);
map.addLayer(markers);

// add an OpenStreetMap tile layer
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

map.fitBounds(bounds, {paddingTopLeft: [0, 42]});
if (map.getZoom() > 16) {
    map.setZoom(16);
}