Ripping subtitles by chapter

[headless chicken]

I have a lengthy movie (2hrs 40 min) that I would like to rip to 2 XviDs with Handbrake. However, I'd also like to create a subtitle file for each half. How would I go about doing this?

I know Handbrake only allows you to permanently burn the titles in to the picture. What program could I use to split the subtitle file where I need to (by chapter), or rip on a chapter by chapter basis?

[Adub]

the Vobsub ripper allows you to rip the .sub files by chapter, angle, or whatever you want.
It is called VSRip.exe.
Here, I'll find the file for you.

Edit:Here you go:
http://www.videohelp.com/tools?tool=VSRip

you can click on either the Main tool site, or the mirror site if you want to download it right away.

[headless chicken]

Thanks. I'm still not sure how to proceed, after selecting PGC1. There are more subfiles than there are chapters, so I don't know which cell corresponds to what. How do I go about figuring this out?