how to have a transparent/no background in desktop of gnome 2.6.1

[J.S.Sahambi]

I want to run mplayer in rootwindow and I think I have have to disable 
the background of gnome desktop. I am using Debian/unstable with gnome 
2.6.1 and could not find any way to disable the gnome background. Can 
anyone give some ideas?

Thanks
JSS
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