In dreamweaver you can create frames. (I can't remember the code for frame, but you can do it visualy). You'll have to end up whit an indexpage.html that contains the code for the framedefenition.
A navBar.html that is loaded in the navbar frame. And the contentframe that contains your opening_page.html.
index.html
frame -> navbar
frame -> content
You 'll have to name your frames to get the linking right.
for the links in the navbar use someting like
<a href="contentpage.html" target="name_content_frame">blabla</a>
for the links int the content use someting like
<a href="contentpage.html" target="_self">blabla</a>
Amiga 500 - 68000 processor / 7 Mhz, 512 Kb RAM, 4-channel PCM synthesizer (stereo)