Adding Footers To Static Html

I'm running a Windows 2000 server with IIS. I have ASP execute access on the server. My users publish their pages onto our webserver by copying their files onto their respective directories in the server.

I intend to have each author append <meta> tags which describe information such as: author name, authorEmailAddress, authorPhoneNumber, etc..

When a user browses a particular page on the server, the web server will need to read this information (the meta tags) from the requested HTML file, and append an "Author block" at the bottom which contains some of the meta-information, as well as determining the Created Date and Last Edited date from the HTML file itself (from the filesystem).

I'd also need to include some kind of conditionals such as making the author block red if the last update date was more than 30 days ago (todaysDate-FileSystem[currentHTMLfile]).

How can I do this? I'm truly puzzled. I don't want make my authors use .ASP files because this gives my authors too much power (not to mention most are computer illiterate). I'd like for them to write static content, while the server appends content that is generated dynamically.