diff --git a/public/javascripts/map.js b/public/javascripts/map.js
index 217e6e758..0f842cf48 100644
--- a/public/javascripts/map.js
+++ b/public/javascripts/map.js
@@ -5,7 +5,6 @@ var popup;
 function createMap(divName) {
    map = new OpenLayers.Map(divName,
                             { maxExtent: new OpenLayers.Bounds(-20037508,-20037508,20037508,20037508),
-                              numZoomLevels: 19,
                               maxResolution: 156543,
                               units: 'm',
                               projection: "EPSG:41001" });
diff --git a/public/openlayers/OpenStreetMap.js b/public/openlayers/OpenStreetMap.js
index 40722d4e0..8329aef8b 100644
--- a/public/openlayers/OpenStreetMap.js
+++ b/public/openlayers/OpenStreetMap.js
@@ -109,6 +109,7 @@ OpenLayers.Layer.OSM.Mapnik = OpenLayers.Class(OpenLayers.Layer.OSM, {
             "http://b.tile.openstreetmap.org/",
             "http://c.tile.openstreetmap.org/"
         ];
+        options = OpenLayers.Util.extend(options, { numZoomLevels: 19 });
         var newArguments = [name, url, options];
         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
     },    
@@ -136,6 +137,7 @@ OpenLayers.Layer.OSM.Osmarender = OpenLayers.Class(OpenLayers.Layer.OSM, {
             "http://b.tah.openstreetmap.org/Tiles/tile.php/",
             "http://c.tah.openstreetmap.org/Tiles/tile.php/"
         ];
+        options = OpenLayers.Util.extend(options, { numZoomLevels: 18 });
         var newArguments = [name, url, options];
         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
     },