create APIMethod for obtaining the view port, this is needed by GeoExt to append the map panel items there so that they don't interfere with the zoombox for example

lib/OpenLayers/Map.js

@@ -613,6 +613,17 @@ OpenLayers.Map = OpenLayers.Class({
         }
     },
 
+    /** 
+     * APIMethod: getViewport
+     * Get the DOMElement representing the view port.
+     *
+     * Returns:
+     * {DOMElement}
+     */
+    getViewport: function() {
+        return this.viewPortDiv;
+    },
+    
     /**
      * APIMethod: render
      * Render the map to a specified container.