You're probably going this route in things...
for audio you'd probably need something like this:
http://www.yourcablestore.com/6-Foo...
For video something like these... ((NOTE: I can't be sure these are the correct items that will work for you... make sure you read the specs and make sure there's a return policy if they don't work))
http://www.bhphotovideo.com/bnh/con...
http://www.pccables.com/cgi-bin/ord...
If you're stuck on going directly from DVI to s-video.. I'd suggest getting one of these:
http://cgi.ebay.com/DVI-VGA-ADAPTER...
You won't notice any difference with VGA vs DVI to s-video... this is because VGA and DVI are so much better than S-video... and s-video is so crappy compaired to them.... that it's not with the extra expense of buying a "converter box" that will take you directly from DVI to S-Video.
If you're TV had something better like component, VGA, DVI or HDMI inputs... then it might be worth it... but then you'd only need a converter for component... and the rest wouldn't matter, lol.
and yes component (red,green,blue) is different from coposite (yellow with red/white audio).
TK.