I ran into a particularly odd problem when I moved to Flash CS3. It no longer allowed me to place batch files in the fscommand directory and call them from a flash projector file. I found this article while searching for a reason why, and it provides an excellent way to overcome the current issue…

Here is a great article on what it takes to embed flash on your web pageswhile still validating for XHTML Strict standards. http://alistapart.com/articles/flashsatay