SWFObject is a small Javascript file used for embedding Macromedia Flash content. The script can detect the Flash plug-in in all major web browsers (on Mac and PC) and is designed to make embedding Flash movies as easy as possible. It is also very search engine friendly, degrades gracefully, can be used in valid HTML and XHTML 1.0 documents*, and is forward compatible, so it should work for years to come.
Using SWFObject is easy. Simply include the swfobject.js Javascript file, then use a small amount of Javascript on your page to embed your Flash movie. Here is an example showing the minimum amount of code needed to embed a Flash movie:
<script type="text/javascript" src="swfobject.js"></script>
<div id="flashcontent">
This text is replaced by the Flash movie.
</div>
<script type="text/javascript">
var so = new SWFObject("movie.swf", "mymovie", "200", "100", "7", "#336699");
so.write("flashcontent");
</script>
Read more here
* Pages sent as text/html, not application/xhtml+xml.
