docs: function() {
  
          this.div.style.backgroundColor = "darkblue";
  
          var viewSize = this.map.getSize();
          
          var msgW = Math.min(viewSize.w, 300);
          var msgH = Math.min(viewSize.h, 200);
          var size = new OpenLayers.Size(msgW, msgH);
  
          var centerPx = new OpenLayers.Pixel(viewSize.w/2, viewSize.h/2);
  
          var topLeft = centerPx.add(-size.w/2, -size.h/2);            
  
          var div = OpenLayers.Util.createDiv(this.name + "_warning", 
                                              topLeft, 
                                              size,
                                              null,
                                              null,
                                              null,
                                              "auto");
  
          div.style.padding = "7px";
          div.style.backgroundColor = "yellow";
  
          div.innerHTML = this.getWarningHTML();
          this.div.appendChild(div);
      }