<html>
<head>
  <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
  <script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
  <script src="TileLayer.Common.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.1/underscore-min.js"></script>
  <style>
    b { font-size: 110%;  color: red; }
    #debug { width: 600px; white-space: nowrap;