Really? UNIX - bummer. Well, hmmm, I guess if you want to only use JavaScript, then you will need to either document.write() them, or insert using innerHTML. So you could write an external js file which has all the writing stuff, then embed it in the pages - much like an include call - only you have to enclode everything in quotes.
<body>
...
<script src="URLForcode.js"></script>
...
</body>
This means you can change the contents of this piece - by altering the code in URLForcode.js. By the way, the only difference here is that SSI include interprets a pure text file for you , as HTML.
b2 - benbiddington@surf4nix.com