Switching between Displays

Hello.
I have an imac and am using Leopard OS X. I hooked up my HDTV to the computer, and am just wondering. Is there any way to turn off the computer screen and just watch the tv screen. I cannot seem to find any way to turn off the computer screen without turning the tv off. I have figured how to arrange the displays, mirror them, but no way to turn off one screen to watch a movie, etc. Any help would be greatly appreciated!!
Thank you!
Lisa

Thank you for the help Malcolm. I have been searching and searching for ways to turn the computer monitor off, but there is not way. Since there is no way to turn it off, I guess I will do that.
Thanks again,
Lisa

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