Embed media issue

Help!

I’ve set up WordPress on a private server… I’m attempting to embed mp4 files into the post. I have this successfully working on other subdomains on the same server… but for some reason it just won’t work now!

Previously, I was getting a

“The requested URL /library was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.”

error, but then I updated my permalinks as suggested while researching this issue. Now I’m getting a strange, small iframe within the post that shows the main blog itself. Confusing, I know. I can send screenshots if that’d be helpful, but unfortunately I can’t show the site itself due to security issues. Here’s the embed code I’m using:

<object wmode=”transparent” width=”100%” height=”100%”><param name=”movie” value=”http://www.subdomain.citizensof.com/wp-content/uploads/2011/04/motion13-3.mp4”></param><param name=”allowFullScreen” value=”true”></param><param name=”allowscriptaccess” value=”always”></param><embed wmode=”transparent” src=”http://www.subdomain.citizensof.com/wp-content/uploads/2011/04/motion13-3.mp4” allowscriptaccess=”always” allowfullscreen=”true” width=”100%” height=”100%””></embed></object>

Any help would be greatly appreciated!