Laptop W/ Broken Monitor


My PowerBook 15" Titanium (running OSX 10.3.9) has a broken monitor. I don't want to pay to fix it, because I can start up with another monitor attached through the built-in DVI port. But it still behaves as though its built-in monitor is attached. My questions are:

1) How do I trick the videocard into thinking that it has only one monitor, attached through DVI?

but more to the point...

2) How can I use the external monitor as my main display, AND the S-VIDEO out, not mirrored?

To reiterate: scrap the internal altogether, use an external display thru DVI, AND use non-mirrored S-VIDEO?

Thanks... Crossing fingers...