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: 
  
  <script id="changeset_list_template" type="text/x-jsrender">
  Visible changesets <i>(limit = 100, shown from zoom level = 12)</i>
  <br /><br />
  <ul style="list-style-type: none; padding: 0; margin: 0; font-size: smaller">
  {{for features}}
  