Help with two wallpapers for dual monitors and ati 9800

I have a ati 9800 ( love it) and 21" and 17" monitor. they are at different resolutions. both on the ati card. and am able to move things accross them both fine. I want to be able to set a different wallpaper on each monitor. I'm sure there's an easy way to do this.
any help please

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Anyone who wants the answer to this question, it has been answered here:

http://forum.oc-forums.com/showthread.php?s=&threadid=245606

thank you, sorry i could find it