Okay, if you're using XP or 2000 (I don't know about 98) make a folder of the Logan pictures you want to show on the slideshow.
Then go to the Control Panel and Appearance and Themes open the Screensaver.
Choose "My Pictures Slideshow" and tell it to show the folder you made.
In settings tell it how often to change and how big to make the pictures.
VOILA!!
LOGAN 24/7!!!!!