give popups a reference back to map

git-svn-id: http://svn.openlayers.org/trunk/openlayers@335 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -170,6 +170,7 @@ OpenLayers.Map.prototype = {
     * @param {OpenLayers.Popup} popup
     */
     addPopup: function(popup) {
+        popup.map = this;
         this.popups.push(popup);
         var px = this.getLayerPxFromLonLat(popup.lonlat)
         var popupDiv = popup.draw(px);