Dragan,
Yes, I'd just write disk files in this case. they can all just reference the css file, and using an "ordinary" browser on the files makes sense too. Have you thought about bundling it all up into a CHM file?
>I tried inserting the stylesheet (surrounded by Style and /Style tags) just before the /head tag, and it worked. But then I still needed the links to work (I'm writing about sixty pages, linked to each other, a hypertext thingy), and didn't really want to bother with capturing the navigate event and intercepting the link just to do another write(). With writing to disk, I can still use another browser as just another check, so in this case - yes, I have lots of reasons to write to disk.