Using toggle code - any way to convert BR to newline?

I'm using the sample toggle code to switch between normal textarea and full editor modes, which is working great, but I was wondering if there's any way to automatically convert all of the BR's to newlines when switching from editor back to textarea mode. I have already configured FCKeditor to ONLY use BR linebreaks. Unfortunantly I am completely unfamiliar with JavaScript.

My concern is if people switch back to textarea mode and see their whole message with no breaks, they may manually put some back in and I'll end up with double spacing.