Looks like you are using frames?
If so each frame has a name.
and when you make a link you add something like
<a href="http://free-legal-forms-letters.com/" target="_my-frame">
You can also use target to open up a page in a new window by using a name that isn't already defined.
Should warn you that many search engines cannot navigate frames and this kind of thing is better done with tables or perl/php/asp
If you can't do CGI but are lucky anough to have Dreamweaver it can help handle menus using a template and when it is updated all the pages that use it are updated also.
http://www.KumKie.com http://bulldog.servegame.com