I'm sure Apple has used some software tool to "parse" their existing page code to add the new javascript tags. They have millions of pages with QuickTime content. I've looked at the page source code for their movie trailers pages and every one I visited has the new code.
Since all of my pages are "custom" made and make various different object and embed tag code combinations I can only make the changes by "hand coding".
I don't know if Apple will automatically edit existing Movie Homepages or iWeb sites that use the older code. I've visited some some older Homepage and iWeb movie pages and all I see is the older page code.
The new code replaces all of the object and embed tags with lines of code that look something like this:
<script language="JavaScript" type="text/javascript"><!--
QT
WriteOBJECT('http://homepage.mac.com/kkirkster/clone/clonedbaby.mov', '550', '401','','controller','false','emb#bgcolor','000000','autoplay','true','loop',' true','cache','true','kioskmode','true');
// --></script>
This is in addition to a site wide use of a special javascript file that "interprets" this new code and passes on the other needed tags to call ActiveX on IE browsers or older "Netscape style" plug-ins like those used on Mac's.