From 8b909e9e5366afffd52c644ecdd2f472be9499c6 Mon Sep 17 00:00:00 2001
From: euzuro <euzuro@metacarta.com>
Date: Fri, 6 Oct 2006 18:23:51 +0000
Subject: [PATCH] bringing down r1660 from sandbox/euzuro/layerclone

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1661 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/BaseTypes.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/OpenLayers/BaseTypes.js b/lib/OpenLayers/BaseTypes.js
index d156d61a1b..3fdd2aa2b0 100644
--- a/lib/OpenLayers/BaseTypes.js
+++ b/lib/OpenLayers/BaseTypes.js
@@ -115,7 +115,11 @@ OpenLayers.Pixel.prototype = {
     * @type OpenLayers.Pixel
     */
     offset:function(px) {
-        return this.add(px.x, px.y);                
+        var newPx = this.clone();
+        if (px) {
+            newPx = this.add(px.x, px.y);
+        }
+        return newPx;
     },
     
     /** @final @type str */