Store the original map options into 'options' property

lib/OpenLayers/Map.js

@@ -239,6 +239,12 @@ OpenLayers.Map = OpenLayers.Class({
      */
     panRatio: 1.5,    
 
+    /**
+     * APIProperty: options
+     * {Object} The options object passed to the class constructor. Read-only.
+     */
+    options: null,
+
   // Options
 
     /**
@@ -480,6 +486,9 @@ OpenLayers.Map = OpenLayers.Class({
         this.theme = OpenLayers._getScriptLocation() + 
                              'theme/default/style.css'; 
 
+        // backup original options
+        this.options = OpenLayers.Util.extend({}, options);
+
         // now override default options 
         OpenLayers.Util.extend(this, options);
         
@@ -731,6 +740,7 @@ OpenLayers.Map = OpenLayers.Class({
         this.events.destroy();
         this.events = null;
 
+        this.options = null;
     },
 
     /**