How do I embed Youtube videos in posts via the posting box?

[NeoDB]

But wait, before you link me to some codes or mods that do this or that, here's what I mean...

When I post a message on my vBulletin board, I want to work with me just plopping a whole Youtube address in the middle of that, not just the last part.

[Dismounted]

Search does wonders ;).

[NeoDB]

Apparently not, since I can't find one that does what I need.