Форуми / Cotonti / Support / Youtube bbcode

This plugin: http://www.cotonti.com/forums.php?m=posts&q=2227&d=15

Yes, I checked the container checkbox.

Let me explain it once more, just to be clear.

Now the code is for example:

[youtube=WoAXW30mMAg]

But I would like it to be:

[youtube=http://www.youtube.com/watch?v=WoAXW30mMAg]

or:

[youtube]http://www.youtube.com/watch?v=WoAXW30mMAg[/youtube]

Now visitors need to copy paste the last bit of the url instead of the whole url, which is a bit confusing for most people since on most forums you just copy/paste the whole url in to youtube tags.

Any ideas how to get this to work?