Turning off MBP Display when Cinema Display connected

Hello,
Sorry if this is a stupid question but I have a 23" Cinema Display attached to my MBP via DVI and although it's great to watch DVDs on, I would like to turn off my MBP display whilst doing this to save energy, reduce the distraction etc - is there a way of doing this?
Help appreciated.

You'd need an external keyboard and mouse as well. Follow these steps:
http://support.apple.com/kb/HT3131
Alternatively, there are haxies that disable lid-closed sleep:
SleepLess: http://www.alxsoft.com/mac/sleepless.html
InsomniaX: http://semaja2.net/insomniaxinfo/ (not sure if this works in 10.5)

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