anchor.diff:  
     function zoomEvent() {
       var vis = map.getZoom() > 12;
  -    //layerVector.setVisibility(vis);
  +    layerVector.setVisibility(vis);
       //document.getElementById("visstatus").style.visibility = vis ? "hidden" : "visible";
     }
   
  
positive.code:                    "default": {'strokeWidth': 4, 'strokeColor': "green"},
                     "highlight": {'strokeWidth': 4, 'strokeColor': "blue"}
                   }),
                   visibility: true
              });
              map.addLayer(layerVector);
  
  
negative.code:               }
  
              );
        map.events.register("zoomend", this, zoomEvent);
        map.events.register("moveend", map, updateLocation);
  
        var highlightControl = new OpenLayers.Control.SelectFeature(layerVector, {"hover": true, "highlightOnly": true, "renderIntent": "highlight"});
  