Actually if you have php on your website it will be very easy to use it. Here is all the 'learning curve' you need. If your navbar is 'fixed' code, that is, it has no php variables of any kind, and can be written as a plain text file, even if it includes javascript and css, just name it navbar.txt and put this where you want to locate it on a page:
PHP Code:
<?php include("navbar.txt"); ?>
Of course you need to give the correct path. php will just write the text verbatim to the page, and it will need to be done for every page.