Index: src/django_gheat/wlheatmap/static/OpenStreetMap.js
===================================================================
--- src/django_gheat/wlheatmap/static/OpenStreetMap.js	(revision 9381)
+++ src/django_gheat/wlheatmap/static/OpenStreetMap.js	(revision 9382)
@@ -29,4 +29,14 @@
 };
 
+var wl_balancers = ['a','b','c','d','e','f'];
+function get_balanced_urls(prefix, balancers, suffix) {
+  var urls = [];
+  for (i=0 ; i < balancers.length; i++) {
+    urls.push(prefix + balancers[i] + suffix);
+  };
+  return urls;
+};
+
+
 /**
  * Class: OpenLayers.Layer.OSM.Mapnik
@@ -44,12 +54,5 @@
      */
     initialize: function(name, options) {
-        var url = [
-            "http://a.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png",
-            "http://b.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png",
-            "http://c.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png",
-            "http://d.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png",
-            "http://e.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png",
-            "http://f.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png",
-        ];
+        var url = get_balanced_urls('http://', wl_balancers, '.osmproxy.wirelessleiden.nl/heatmap/osm-proxy/${z}/${x},${y}.png');
         options = OpenLayers.Util.extend({ numZoomLevels: 19 }, options);
         var newArguments = [name, url, options];
@@ -165,12 +168,5 @@
 OpenLayers.Layer.OSM.Overlay2 = OpenLayers.Class(OpenLayers.Layer.OSM, {
     initialize: function(name, options) {
-        var url = [
-            "http://a.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=90,90,90",
-            "http://b.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=90,90,90",
-            "http://c.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=90,90,90",
-            "http://d.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=90,90,90",
-            "http://e.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=90,90,90",
-            "http://f.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=90,90,90",
-        ];
+        var url = get_balanced_urls('http://', wl_balancers, '.maps.wirelessleiden.nl/wlheatmap/tile/${z}/${x},${y}.png?colour=90,90,90');
         options = OpenLayers.Util.extend({ numZoomLevels: 21 }, options);
         var newArguments = [name, url, options];
@@ -186,12 +182,5 @@
 OpenLayers.Layer.OSM.Overlay3 = OpenLayers.Class(OpenLayers.Layer.OSM, {
     initialize: function(name, options) {
-        var url = [
-            "http://a.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden",
-            "http://b.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden",
-            "http://c.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden",
-            "http://d.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden",
-            "http://e.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden",
-            "http://f.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden",
-        ];
+        var url = get_balanced_urls('http://', wl_balancers, '.maps.wirelessleiden.nl/wlheatmap/tile/${z}/${x},${y}.png?colour=255,0,0&accespoint__ssid__icontains=WirelessLeiden');
         options = OpenLayers.Util.extend({ numZoomLevels: 21 }, options);
         var newArguments = [name, url, options];
@@ -207,12 +196,5 @@
 OpenLayers.Layer.OSM.Overlay4 = OpenLayers.Class(OpenLayers.Layer.OSM, {
   initialize: function(name, options) {
-    var url = [
-      "http://a.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100",
-      "http://b.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100",
-      "http://c.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100",
-      "http://d.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100",
-      "http://e.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100",
-      "http://f.maps.wirelessleiden.nl/heatmap/website/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100",
-    ];
+    var url = get_balanced_urls('http://', wl_balancers, '.maps.wirelessleiden.nl/wlheatmap/tile/${z}/${x},${y}.png?colour=250,250,0&signaal__gte=0&signaal__lte=100');
     options = OpenLayers.Util.extend({ numZoomLevels: 21 }, options);
     var newArguments = [name, url, options];