How to load a Nav page into other pages?

Question

Hi, I am using CSS and HTML. I am not using a template. Not
an expert.
I want to have just one page with all main navigation links.
Parent link/list and subordinate links/list as drop down. No page
templates.
How can I get pages 1 to 10 to load a 2nd page that possesses
all the nav links? Would load into an <iframe> but first I do
not want to use that. Second I do not know how to z-index it so the
drop down links are on top of any page 1-10 info that is in the
way?
The Parent Nav link/list is horizontal and only needs to show
main parent row. Subordinates will drop down. Do not want to have
to have 1 row showing for all possible drop down rows. Ex.
Header
<div>Parent link/list with drop downs that z-index to
on top
<div>other things
currently I get loose all drop downs to <div>other
things.
How can I accomplish this?

Answer 1

[nav.php]
<!-- Begin Navigation -->
<div id="navigation">
<ul class="nav">
<li><strong> <a href="
http://www.timlist.net/"
target="_parent">Home</a> </strong></li>
<li><strong><a href="
http://timlist.net/arianna.html"
target="_parent">Arianna</a></strong>
<ul>
<li><a href="
http://timlist.net/arianna/art.html"
target="_parent">Art</a></li>
<li><a href="
http://timlist.net/blog.html"
target="_parent">Blog</a></li>
<li><a href="
http://www.charitynavigator.org/"
target="_parent">Charity Navigator</a></li>
<li><a href="
http://timlist.net/not_ready.html"
target="_parent">Gallery</a></li>
<li><a href="
http://timlist.net/not_ready.html"
target="_parent">The Word</a></li>
<li><a href="
http://timlist.net/not_ready.html"
target="_parent">Safety</a></li>
<li><a href="
http://timlist.net/memorial.html"
target="_parent">Memorial</a> </li>
</ul>
</li>
<li><strong><a href="
http://timlist.net/boating.html"
target="_parent">Boating</a></strong>
<ul>
<li><a href="
http://timlist.net/boating/brands.html"
target="_parent">Boat Brands</a></li>
<li><a href="
http://timlist.net/boating/types.html"
target="_parent">Boat Types</a></li>
<li><a href="
http://timlist.net/boating/sales.html"
target="_parent">Buy &amp; Sell</a></li>
<li><a href="
http://timlist.net/boating/drives_fuels.html"
target="_parent">Drives &amp;  
Fuels</a></li>
<li><a href="
http://timlist.net/boating/education.html"
target="_parent">Education</a></li>
<li><a href="
http://timlist.net/boating/fishing.html"
target="_parent">Fishing</a></li>
<li><a href="
http://timlist.net/boating/misc.html"
target="_parent">Miscellaneous</a></li>
<li><a href="
http://timlist.net/boating/terms.html"
target="_parent">Terminology</a></li>
<li><a href="
http://timlist.net/boating/stores.html"
target="_parent">Stores</a></li>
</ul>
</li>
<li><strong><a href="
http://timlist.net/camping.html"
target="_parent">Camping</a></strong>
<ul>
<li><a href="
http://timlist.net/camping/camping_buy_sell.html"
target="_parent">Buy/Sell</a></li>
<li><a href="
http://timlist.net/camping/camping_clubs_forums.html"
target="_parent">Clubs</a></li>
<li><a href="
http://timlist.net/camping/camping_games_cooking.html"
target="_parent">Cooking</a></li>
<li><a href="
http://timlist.net/camping/camping_clubs_forums.html"
target="_parent">Forums</a></li>
<li><a href="
http://timlist.net/camping/camping_games_cooking.html"
target="_parent">Games</a></li>
<li><a href="
http://timlist.net/camping/camping_gear.html"
target="_parent">Gear</a></li>
<li><a href="
http://timlist.net/camping/camping_grounds_guides_mags.html"
target="_parent">Grounds</a></li>
<li><a href="
http://timlist.net/camping/camping_grounds_guides_mags.html"
target="_parent">Guides</a></li>
<li><a href="
http://timlist.net/camping/camping_hardware.html"
target="_parent">Hardware</a></li>
<li><a href="
http://timlist.net/camping/camping_grounds_guides_magazines.html"
target="_parent">Magazines &amp; News</a></li>
<li><a href="
http://timlist.net/camping/camping_misc_safety.html"
target="_parent">Miscellaneous</a></li>
<li><a href="
http://timlist.net/camping/camping_manufacturers.html"
target="_parent">Manufacturers</a></li>
<li><a href="
http://timlist.net/camping/camping_safety.html"
target="_parent">Safety</a></li>
</ul>
</li>
<li><strong>Customer Service</strong>
<ul>
<li><a href="
http://timlist.net/customer_service/customer_service_101.html"
target="_parent">Basics 101</a></li>
<li><a href="
http://www.timlist.net/customer_service/customer_service_reviews.html/"
target="_parent">Reviews</a></li>
<li><a href="
http://www.timlist.net/customer_service/customer_service_reviews_template.html/"
target="_parent">Templates</a></li>
</ul>
</li>
<li><strong>Diesels</strong>
<ul>
<li><a href="
http://timlist.net/trucks/diesel_trucks.html"
target="_parent">Diesel Trucks</a></li>
<li><a href="
http://timlist.net/trucks/forums.html"
target="_parent">Forums</a></li>
<li><a href="
http://timlist.net/trucks/fuel.html"
target="_parent">Fuel</a></li>
<li><a href="
http://timlist.net/trucks/misc.html"
target="_parent">Miscellaneous</a></li>
<li><a href="
http://timlist.net/trucks/parts_repair.html"
target="_parent">Parts Repair</a></li>
<li><a href="
http://timlist.net/trucks/studies.html"
target="_parent">Studies</a></li>
<li><a href="
http://timlist.net/trucks/towing.html"
target="_parent">Towing</a></li>
</ul>
</li>
<li><strong><a href="
http://timlist.net/family.html">Families</a></strong></li>
<li><strong><a href="
http://timlist.net/gallery.html">Galleries</a></strong></li>
<li><strong><a href="
http://timlist.net/search.html">Search-It</a></strong></li>
<li><strong>Technology</strong>
<ul>
<li><a href="
http://timlist.net/technology/audio.html"
target="_parent">Audio</a></li>
<li><a href="
http://timlist.net/technology/forums_support.html"
target="_parent">Forums</a></li>
<li><a href="
http://timlist.net/technology/graphics.html"
target="_parent">Graphics</a></li>
<li><a href="
http://timlist.net/technology/hardware.html"
target="_parent">Hardware</a></li>
<li><a href="
http://timlist.net/technology/html.html"
target="_parent">HTML</a></li>
<li><a href="
http://timlist.net/technology/java.html"
target="_parent">Java</a></li>
<li><a href="
http://timlist.net/technology/misc.html"
target="_parent">Miscellaneous</a></li>
<li><a href="
http://timlist.net/technology/programing.html"
target="_parent">Programming</a></li>
<li><a href="
http://timlist.net/technology/software.html"
target="_parent">Software</a></li>
<li><a href="
http://timlist.net/technology/stores.html"
target="_parent">Stores</a></li>
<li><a href="
http://timlist.net/technology/forums_support.html"
target="_parent">Support</a></li>
</ul>
</li>
</ul>
</div>
<!-- End Navigation -->