Extrenal display ON and ibook screen OFF impossible ???

Hello,
I am using an external display 19" with my ibook, it can bu used either in mirror mode either with two different image (very convenient!!) but when I just want to use the big screen and have the ibook screen off I simply don't find the way to do it ??
If I close the screen , the ibook will go on save mode and my external display will go on save also.
Any idee to switch my ibook screen off and keep on working with my external display. In fact I am using my ibook as a king of tower computer..
Thanks for any help.
Fred

yessssss !! it works , thanks for the idea, by the way go here
http://forum.macparts.de/viewtopic.php?t=676
everything is clearly explained and workd perfectly.
MAC IS GOOD......
IBOOK 14 G4 Mac OS X (10.4.9)

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==================================
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