Screensaver over an extended Desktop, how?

[liveseytowers]

I'm hoping that someone can help with this.

I'm using a Laptop at the moment with an extended desktop on a 17" TFT. I want a screensaver that will work on both screens, something that fly's between one screen and the other (like on the film swordfish although on a smaller scale )

I've had a look on google and its not that obvious what to do or which screensavers to download?

Has anyone set up their PC's like this and managed to have a floating screensaver over an extended desktop? If so any advise is greatly appreciated/needed