Stop the iMac screen while using an external monitor.

I succeeded to play an .avi file in full screen on my 32" samsung lcd...but i would like to stop the iMac monitor while watching the avi. If i choose to stop the iMac monitor also the tv screen became black, and also if i start a screensaver on the iMac this will also appear on the lcd tv evenif i set up the external monitor as an extension of the desktop and not as a duplicate. There's a solution?
Tnx for the answers and sorry for my poor english

That one as well will dim both displays.
I have played around with this off and on for over a year now. The best that I have come up with is in this [Apple Discussion Thread|http://discussions.apple.com/message.jspa?messageID=5587803#5587803]
Sense then I have also found a way to dim the menu bar, but it was a little buggy to use all the time called [MenuShade|http://macapper.com/2007/10/17/menushade-dim-your-menu-bar>
Simply hide everything on the desktop as best you can and use a black desktop or photo image.
Dennis

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