Among other things, you seem to have lost a couple of end tags for if's in your navbar template.
A good way to debug these things is to use the html validation service at
http://validator.w3.org
Either do a view source/save, then upload the faulty page onto the validator form, or simply point the validator at one of your pages that is broken.
I've done a quick check, and there are a whole set of problems, which are probably related to faulty tempate edits.