code: function(id, lonlat, contentSize, contentHTML, anchor, closeBox, 
                          closeBoxCallback) {
  
          OpenLayers.Popup.Anchored.prototype.initialize.apply(this, arguments);
  
          if (this.fixedRelativePosition) {
              //based on our decided relativePostion, set the current padding
              // this keeps us from getting into trouble 
              this.updateRelativePosition();
              
              //make calculateRelativePosition always return the specified
              // fixed position.
              this.calculateRelativePosition = function(px) {
                  return this.relativePosition;
              };
          }
  
          this.contentDiv.style.position = "absolute";
          this.contentDiv.style.zIndex = 1;
  
          if (closeBox) {
              this.closeDiv.style.zIndex = 1;
          }
  
          this.groupDiv.style.position = "absolute";
          this.groupDiv.style.top = "0px";
          this.groupDiv.style.left = "0px";
          this.groupDiv.style.height = "100%";
          this.groupDiv.style.width = "100%";
      }
docs: Constructor: OpenLayers.Popup.Framed
  
  Parameters:
  id - {String}
  lonlat - {<OpenLayers.LonLat>}
  contentSize - {<OpenLayers.Size>}
  contentHTML - {String}
  anchor - {Object} Object to which we'll anchor the popup. Must expose
  a 'size' (<OpenLayers.Size>) and 'offset' (<OpenLayers.Pixel>)
  (Note that this is generally an <OpenLayers.Icon>).
  closeBox - {Boolean}
  closeBoxCallback - {Function} Function to be called on closeBox click.