Have a mac os x version 10.5.4 trying to get itunes album artwork screensaver but it isn't found in the screensaver preferences. Help?

There is a couple threads on Macfourms.com (http://www.mac-forums.com/forums/ipod-hardware-accessories/69915-where-do-i-get-itunes-album-art-screensaver.html) that deal with this.