Pulled down bug fixes, example updates, etc. r717:r787 from source:/branches/openlayers/1.0.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@788 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/PanZoom.js

@@ -111,6 +111,7 @@ OpenLayers.Control.PanZoom.prototype =
      * @param {event} evt
      */
     buttonDown: function (evt) {
+        if (!Event.isLeftClick(evt)) return;
 
         var slide = this.map.getResolution() * this.slideFactor;
         var center = this.map.getCenter();