External screen in vertical mode - how to do it ?

I have a 20" Dell external screen which can rotate 90 degrees, I need to use it in vertical mode but I don't know how, neither if it's possible with the ATI Mobility Radeon 9000 card which is in my Powerbook.
Is it possible with Tiger ?
Thanks if anyone can help me..!

I believe it's a 10.4 thing only.
Upon further inspection on the ATI website:
https://support.ati.com/ics/support/KBAnswer.asp?questionID=1362
(Click the release notes - you have to access the release notes from that webpage)
the updated driver seems to indicate that rotation is a new feature for 10.4 for various Radeons, including Mobility RADEON 9000 (PowerBook).
I think Tiger is worth it even if you didn't use rotation, or you can wait for 10.5

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