Just a quick note...
Allowing an iframe to be posted in a forum is a high security risk. Most forums that become attacked have iframe code injected in to them, which passes on trojans to clients/members that can spread to other forums. I, personally would not allow any iframe code in any of my forums for this very reason.
I just noticed in your coding you are using the table tags, these are not compliant with vBulletin 4, which uses Strict xHTML, well modifications should do, even though there are quite a few around that do not.
Regards,
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