questions about srt files

[greedy_lars]

im new to srt files, and now have questions.

a. is a particular srt file made for a particular avi or mpg? are they perfect matched pairs, or can one from a differant rip work?

also,

b. what if you get flix that need translation, but no srt, is their a way to search for them? i tried google but what a forking mess, mostly explanations of what they are.

thanks