SWFObject

http://code.google.com/p/swfobject/

http://www.adobe.com/devnet/flashplayer/articles/swfobject.html

http://www.adobe.com/devnet/flashplayer/articles/alternative_content.html

Traditional publishing mechanisms for rich media content created for Adobe Flash Player often rely on the twice-cooked method to embed SWF files into HTML pages. One major drawback of this method is that it is based on old-fashioned, vendor-specific markup that doesn't comply with modern web standards and also doesn't allow you to nest fallback content inside of it.

To solve this problem, we created SWFObject 2, which offers multiple standards-friendly methods to embed rich media content into web pages. It supports the use of alternative (substitute) content to display content to people who browse the web without plug-ins, to help search engines index your content, and to point visitors to the Adobe Flash Player download page.