Autoprepending scripts with Apache

[Victor Tsaran]

Hello, listers!
Those of you, who are experts in Apache server administration. Do you know
if there is an option to auto_prepend a certain script to any .html file
parsed by the server? For example, I have a script written in PHP and I want
it to be attached to every .html file of the website. Please note that I
would like to avoid using SSI because this would involve modifying all the
pages on the website.
Would be grateful for any advice.
Victor