Question about editing CSS Frames

[Weazol]

Ok I have looked all over and I am trying to see if there is something I am missing.
Right now I have made a css sheet I like.

So say my welcome page is


<div id="container">
<div id="header">
LOGO
</div>
<div id="navbar">
<ul>
<li><a>link1</a></li>
<li><a>link2</a></li>
<li><a>link3</a></li>
</ul>
</div>
<div id="sidebar">
<span class="custom-button"><a>Link1</a></span>
<span class="custom-button"><a>Link2</a></span>
<span class="custom-button"><a>Link3</a></span>
</div>
<div id="content">
Welcome... blah blah
</div>
<div id="footer">
Unless otherwise stated, the content of this page is licensed
under <a href="http://www.gnu.org/copyleft/fdl.html">GNU
Free Documentation License.</a>
</div>
</div>



So I use that same layout for all my other pages.

My Question
If I was to change one of the 3 links I would have to go onto every single page and fix them.
Is there an easy way?