Forum Moderators: not2easy
Do you mean change what links actually appear in the nav bar?
Or just change the appearance of the nav bar itself?
If its the former then I would counsel against it.
A page should be usable with CSS turned off: this is important for search engines, accessibility and more limited internet devices.
If you mean the latter, then sure, thats what CSS is there for.
<body>
<div id="maincontent">
<p>blah blah blah</p>
</div>
<?php include 'navbar.html'?>
</body>
</html>
People often use this technique to add in 'template' code that is the same on multiple pages. Check out the PHP forum if you need more info. :)