There are many CGI/PHP/ASP/JSP you name it..(!) scripts that are capable of doing this - I wrote one myself.

They take a template file, and wrap it around your content. A quick surf of the web will bring up some results no doubt.

Check out: http://www.hotscripts.com/ as they always have something for free...

You will need to have a server that supports one of the above technologies.

You can also use SSI (SHTML pages) and have 2 include files. One for before your content and one for after?

Oh and Kulegamr, Flash is only a highly updatable medium, if you MAKE it that way.