You'll see a thumbnail preview when hovering on the navigation bullet listed above. The thumbnail preview is created by the slider's built-in function, thumbnailPreview, and with the assistance of the Menucool Tooltip widget.
Please visit http://www.menucool.com/slider/thumbnail-preview for detailed instructions.
The image slider shown in this demo does not include advanced features, and thus it is for free. However, the Tooltip widget for showing the thumbnail preview requires a Tooltip license.