Messed Up The Code For A Page

[giannig]

Going back a while ago i started playing around with the code for the original chrome theme. I have now gone back to this blog and realized i have messed something up - but i can't remember which php file it was. When you view the blog from the home page everything seem fine. However, if you view a post or category the navigation has dropped (both the page and the category nav bars) see below link

http://www.googlesmobilephone.co.uk/buy ... 1-unlocked

Just wondered if anyone out there knew which code page i need to replace to get it back to how it should be? I don't want reload the whole theme in case i lose anything.

Thanks in advance