Dreamweaver causing issues withTortuious SVN (Mercurio)?

I am using Dreamweaver CS3...basically when I change a file it ends up and save it everything is fine. But something about Dreamweave makes the file mess up when doing a Diff in SVN. For example if you do a Diff of an older version of that file + the newer version I just changed it ends up showing the ENTIRE page as changed.making it hard to pinpoint exactly what has been changed. Is there way to fix this at all?