g1smd - 8:55 pm on Mar 3, 2012 (gmt 0)
Here is my deal. I do not use any CMS. All of my pages are designed individually, by hand, by me. It takes me 2 weeks to go through all my pages and change the codes.
Ouch! Make a note of the file extension and get your server set up to parse that file extension for PHP code.
Then put that code in a small file all on it's own and save it. Next, on every page of your site delete the code snippet and replace it with
<?php include "codesnippet.html"; ?>
The next time you want to alter the code snippet you only need to alter it in one place in one file.
If you can't do any of that, at least invest in an editor like EditPlus3 that allows you to edit multiple files all at once.