added navigation control so users can at least play around a little

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6536 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/layerswitcher.html

@@ -14,6 +14,7 @@
         var map;
         function init(){
             map = new OpenLayers.Map('map', { controls: [] });
+            map.addControl(new OpenLayers.Control.Navigation());
 
             map.addControl(new OpenLayers.Control.LayerSwitcher({'div':OpenLayers.Util.getElement('layerswitcher')}));