Are you sure? 'Cos when I researched it, in order to allow people to use the bbcode of [youtube][/youtube], this required a mod installed by the board owner (found this info at the phpbb site -- unless phpbb have changed things since then and include it in the newest version). I'll go back and check the site and post the link here where I read that.

That's why I'm thinking a mod for [videosite][/videosite] would be the same case. Maybe looking into the code for what runs the youtube bbcode will offer some clues? Anybody out there know?

HERE'S THE LINK TO THE MOD FOR THE PHPBB [YOUTUBE] BBCODE: http://www.phpbb.com/community/viewtopic.php?t=375183