I am editing about 60 html files by hand and want to include an identical header and footer in each file. For maintenance purposes, I want to be able to update the header and footer on all pages simultaneously as needed. I think the old-fashioned way to do that was using frames, and the new one is PHP.
The problem is that I need to maintain the current URL structure of the site, and all current pages have a .html extension, which seems to bar using PHP without changing server settings.