From 17f96f68a208cc2941a197e0d80dc0f1ba9f4b06 Mon Sep 17 00:00:00 2001
From: fredj <frederic.junod@camptocamp.com>
Date: Thu, 16 Feb 2012 15:09:11 +0100
Subject: [PATCH] Preserve numZoomLevels from options. r=@tonio (see #219)

---
 lib/OpenLayers/Layer/XYZ.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/OpenLayers/Layer/XYZ.js b/lib/OpenLayers/Layer/XYZ.js
index 43535dff79..b2cdefd3d2 100644
--- a/lib/OpenLayers/Layer/XYZ.js
+++ b/lib/OpenLayers/Layer/XYZ.js
@@ -70,10 +70,11 @@ OpenLayers.Layer.XYZ = OpenLayers.Class(OpenLayers.Layer.Grid, {
      * options - {Object} Hashtable of extra options to tag onto the layer
      */
     initialize: function(name, url, options) {
-        options = options || {};
-        if (options.sphericalMercator || this.sphericalMercator) {
-            options.projection = new OpenLayers.Projection('EPSG:900913');
-            options.numZoomLevels = 19;
+        if (options && options.sphericalMercator || this.sphericalMercator) {
+            options = OpenLayers.Util.extend({
+                projection: "EPSG:900913",
+                numZoomLevels: 19
+            }, options);
         }
         OpenLayers.Layer.Grid.prototype.initialize.apply(this, [
             name || this.name, url || this.url, {}, options