edit:

Now currently in:

includes/templates/7th/common/tpl_header.php
includes/templates/7th/common/tpl_footer.php

Which it currently seems to be working in IE as well as FF. However, this is the same code that worked in the past and one day just stopped working in IE.

I tried to add the code to includes/languages/english/html_includes/define_main_page.php via Admin panel route rather than directly in the file and it worked in one browser but not the other. I would like to get it to where I could add my code to any *.php file and/or via the Admin Panel (define) if possible.