SWFObject 2.2 has been released and has a number of new features.
1. Improved DomContentLoaded emulation for Internet Explorer
2. Dynamic library support
3. Callback method for embedding Flash content
4. No more embed tags
5. Improved Flash Player version detection for non-Internet Explorer browsers
6. Improved Adobe Express Install
7. Improved createCSS method
8. Detected user agent properties are now public via the swfobject.ua object
9. No more conditional compilation directives
10. The option to switch off SWFObject's default show/hide behavior
More information found here
http://code.google.com/p/swfobject/wiki/whats_new
An example to implement with javascript is:
<div id="flashHeader" style="height:200px">
Alternative Content
</div>
<script type="text/javascript">
swfobject.switchOffAutoHideShow();
swfobject.embedSWF("flashFile.swf", "flashHeader", "800", "180", "9.0.0", "expressInstall.swf");
</script>