First stage is to get the make and model of the panel. Apple sometimes used different panels in the same model Macs, so check yours specifically. Then you'll just have to find out the pinouts. Maybe you can get them from the manufacturer, or maybe you can work out the pinouts at on the powerbooks logic board. Don't waste your time asking Apple though.
I was told that every model of LCD panel has different pinouts, which ,akes life alot more difficult.