docs: function(id, lonlat, contentSize, contentHTML, anchor, closeBox,
                          closeBoxCallback) {
          var newArguments = [
              id, lonlat, contentSize, contentHTML, closeBox, closeBoxCallback
          ];
          OpenLayers.Popup.prototype.initialize.apply(this, newArguments);
  
          this.anchor = (anchor != null) ? anchor 
                                         : { size: new OpenLayers.Size(0,0),
                                             offset: new OpenLayers.Pixel(0,0)};
      }