nz-map.js

var seafloor = L.tileLayer('tiles/nz-seafloor/{z}/{x}/{y}.png', {
  maxZoom: 9,	
  attribution: 'Map data from <a href="http://www.niwa.co.nz/our-science/oceans/bathymetry">NIWA</a>'
});

var topo = L.tileLayer('tiles/nz-topo/{z}/{x}/{y}.png', {
  attribution: '<a href="http://data.linz.govt.nz/">LINZ</a>, <a href="http://lris.scinfo.org.nz/">LRIS</a>'
});

var map = new L.Map('map', {
  center: [-41.2728, 173.2996], 
  minZoom: 4,
  maxZoom: 11,	
  zoom: 6,
  layers: [topo]
});

var layers = L.control.layers({}, {
  'Seafloor': seafloor,
  'Topographic': topo    
}).addTo(map);