I have a Frontpage 2002 website running since early 2008. There are over 60 pages. Some CSS has been used and PHP includes, for the page footer, for example. I am using Expression Web 2 as my editor. A lot of the code, although working, is highlighted as being invalid. I am thinking about updating the site and thought that the first edit should replace the Frontpage heading content and having an HTML Doctype statement. I would then start to build a CSS stylesheet. Has anyone some tips on updating my site from Frontpage?