this.updateColor(this._backgroundColor);  
  _centerImage: function ()  {    this.updateColor(this._backgroundColor);    var img = this._createImage();    // Use naturalHeight/Width here so we don't scale an image improperly in    // the preview window if the image is resized in the browser window.    var width = this._image.naturalWidth * this._monitor.boxObject.width / screen.width;    var height = this._image.naturalHeight * this._monitor.boxObject.height / screen.height;    img.width = Math.floor(width);    img.height = Math.floor(height);    this._monitor.appendChild(img);  }
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/0f6c796a9092e485b60cb45ef78e7df257df2195/setDesktopBackground.js/clean/browser/components/shell/content/setDesktopBackground.js