I thought the name sounded familiar... hello!
(I'm mostly a LUErker on gamefaqs)
Anyway... youtube stuff is a bit picky on the forum, but I believe you should be able to display the videos if you remove watch?v= from your links (and add the appropriate code) and add in /v/
[flash=560,340]http://www.youtube.com/v/_TP6JHrk-bA[/flash]
http://www.youtube.com/v/_TP6JHrk-bAI'd modify your first post for ya... but it would take up a lot more room, so I'll let you figure out how you want to do it. (Could always shrink the video frame size)