Possible Duplicate:
How do I create a desktop wallpaper slideshow?
How do I set my wallpaper to auto-change periodically?
Can I set up desktop background picture to be set a random file from a given directory every given period of time?
Possible Duplicate:
How do I create a desktop wallpaper slideshow?
How do I set my wallpaper to auto-change periodically?
Can I set up desktop background picture to be set a random file from a given directory every given period of time?