FF reacts weird with "www"

So I’m building this site: http://www.steamitclean.com/catalog

For some odd reason when you view the site in FF at this address:
http://www.steamitclean.com/catalog/
the Flash navigation disappears.

but when you view it a this address:
http://steamitclean.com/catalog/
it shows up. I’m using the swf object to embed the code. It was setup with the original flash code but I changed it hoping it would fix the problem but I got no luck.

Everything works perfect in IE for both “http://” & “http://www”.

Anyone experienced anything like this ever?