How files should be saved, concerning type of line breaks

[William Payne]

Say, I open an existing text file in emacs. I make some changes and when I 
save it, Emacs should not change the type of line breaks (windows-style or 
*nix-style). This is how it works now and that's good and I don't want to 
change it. What I do need to change is the type of line breaks emacs uses 
when I save a new file. Is there something I can put in my .emacs-file that 
says something "always save new text files using linux style line breaks" 
(or windows style, regardless of what platform I am on). I seem to remember 
that there is a command I could issue from within emacs to accomplish this, 
but I would like something automatic so to speak so I can save my files 
using C-x C-s as normal, knowing what the type of line breaks will be used 
regardless of platform.
Why do I want this? Well, when on Windows, I use a CVS version of Emacs that 
I compiled myself. Thus, being made for Windows, Emacs saves new files (or 
should I say buffers being written to disk) using windows style line breaks. 
However, I also use Cygwin which is set to work with *nix-style line breaks, 
that's why I want to change the default behaviour of Emacs.

How do I solve this?

/ WP