renaming files so iTunes Will Not Reshuffle the Order

[Jane Jordan (gmail)]

Hi, all.

I have a book that I converted to MP3 from CDs, and I have renamed  
all the files so it's like 001 etc. all the way up to 411.

But iTunes keps reshuffling the order of them no matter what i do, so  
they don't play inthe right order.  How canI fix this so it doens't  
happen in future? Any thoughts on this greatly appreciated!

Jane