If you don't have scripting abilities you may consider an external Javascript file. Take this example:
header.js:
function header()
{
document.write("MySite <a href='index.html'>Home</a> <a href='about.html'>About</a> etc. "); //Put the header code here
//Note when placing the header code, make sure you replace " (Double Quotes) with /" (Slash and then Double Quote). Ex. /"I have a dream/"
}
For the pages you want the header:
Simply put this between the <head> and </head> tags:
<script type='text/javascript' src='header.js'></script>
And place this where you want the header:
<script type='text/javascript'>
header();
</script>
I would reccomend the PHP, since it is server side (and not executed on the client's browser) if possible. Here's an example:
header.php (Place your header's code in here):
MySite <a href='index.html'>Home</a> <a href='about.html'>About</a> etc. <!-- This is just a sample. Replace this line with your code -->
For a page that you want to put the header simply type:
<?php include('header.php'); ?>
Just make sure PHP is enabled.
Best of Luck,
FlashCreations