Standard User accounts can't view YouTube because of creating Flash objects via JavaScript

In Vista Ultimate, when a Standard User account browses to YouTube, no
videos can be played, instead I see this error message:

"Hello, you either have JavaScript turned off or an old version of
Macromedia's Flash Player."

I believe this has something to do with the way YouTube creates it's Flash
movie files on the page. Most websites that display Flash will put their
movie inside <embed> tags, and for Standard Users this works, but YouTube
uses JavaScript to create a flash OBJECT and then writes it to the html like
so:

var fo = new SWFObject("/player2.swf?video_id=asdf", "movie_player", "450",
"370", 7, "#FFFFFF");
fo.write("playerDiv");

How can I adjust a Standard User account in Vista to allow this? Because
I've tried enabling EVERYTHING in the browser security and still it won't
work.

Thanks!