When you add a page there is an checkbox on the new page dialog that asks if
you want the page included in the nav bar. It is checked by default. Next
time you add a page slow down and review the dialog and all the options.
The nav bar gets it's info from two pieces of info that are located in the
page options, which is located under Tools, Web page options - if you are
using version 2003 (you failed to specify). That is the page title-which is
the text that appears on the nav bar button, and the option to include, or
not, the page in the nav bar. If you uncheck that option on the page then
the nav bar should update itself and pull the page from the nav bar. And in
reverse if you check it on a page then the nav bar should update and add in
that page.

David Bartosik - [MSFT MVP]
http://www.publishermvps.com
http://www.davidbartosik.com