Window.prototype.destroy = function() {
    this._notify("onDestroy");
    Event.stopObserving(this.topbar, "mousedown", this.eventMouseDown);
    Event.stopObserving(this.bottombar, "mousedown", this.eventMouseDown);
    Event.stopObserving(this.content, "mousedown", this.eventMouseDownContent);
    
    Event.stopObserving(window, "load", this.eventOnLoad);
    Event.stopObserving(window, "resize", this.eventResize);
    Event.stopObserving(window, "scroll", this.eventResize);
    Event.stopObserving(this.options.parent, "scroll", this.eventResize);
    Event.stopObserving(this.content, "load", this.options.onload);

    if (this._oldParent) {
      var content = this.getContent();
      var originalContent = null;
      for(var i = 0; i < content.childNodes.length; i++) {
        originalContent = content.childNodes[i];
        if (originalContent.nodeType == 1) 
          break;
        originalContent = null;
      }
      if (originalContent)
        this._oldParent.appendChild(originalContent);
      this._oldParent = null;
    }

    if (this.sizer)
        Event.stopObserving(this.sizer, "mousedown", this.eventMouseDown);

    if (this.options.url) 
      this.content.src = null

     if(this.iefix) 
      Element.remove(this.iefix);

    Element.remove(this.element);
    Windows.unregister(this);
  }