This script is intended to be used as a Halloween script but you can use any image you like for the "Ghosts".
To add an image to the page animation simply add the code
    JSFX.AddGhost ("YOUR_IMAGE.gif");
Where YOUR_IMAGE.gif is the valid path to the image you want to display
(See the source code of this page)

NOTE: The images available with this demo are provided with the example script because as far as I am aware they are royalty free.

You can probably obtain more images either by visiting the resources
www.freegraphicland.com.
www.bestclipart.com.
or by searching the web, as I did this for the images in demo2