docs: function(id, lonlat, contentSize, contentHTML, anchor, closeBox, 
                          closeBoxCallback) {
  
          this.imageSrc = OpenLayers.Util.getImageLocation('cloud-popup-relative.png');
          OpenLayers.Popup.Framed.prototype.initialize.apply(this, arguments);
          this.contentDiv.className = this.contentDisplayClass;
      }