Here is an expanded view of what I am saying with my example above. You would edit your header and footer within reviewpost with my example
HEADER.HTM
Code:
Content visible to verified customers only.
FOOTER.HTM
Code:
Content visible to verified customers only.
Now what I mean by xhtml valid is your tables and such are all closed properly etc since if your header sidebar and footer are not valid html it will lead to improper results.