There are multiple instances of swfobject.js on the page as well as the
Adobe embed js library.
In the <head>
<script src="/js/AC_OETags.js" language="javascript"></script>
<script type="text/javascript" src="/flex/swfobject.js"
language="javascript"></script>
In the body
<script type="text/javascript" src="/flex/swfobject.js"
language="javascript"></script>
You also have other js files which may be breaking things like:
<script type="text/javascript" src="/flex/swfformfix2.js"
language="javascript"></script>
My only suggestion is that you create a stripped down version of the page
without all the other5 stuff (ie only swfobject.js and your flash file).
Once you get that working, slowly add the other .js files / code back and
see what is causing the issue.
I have a suspicion that it is another .js file, not swfobject causing the
message ( you could quickly check this in the reverse by removing the flash
file and the two swfobject.js references and see if the error still occurs)
Aran