[pmwiki-users] Guiedit

[Anno]

  > $GUIButtons ['Youtube'] = array(622, '(:youtube ', '',
> '$[??LetterString??]:)',
>                      '$GUIButtonDirUrlFmt/youtube.gif"$[youtube 
> ??LetterString??]"');


I think you got the syntax wrong. Compare yours with bold:

  array(110, "'''", "'''", '$[Strong]',
                   '$GUIButtonDirUrlFmt/strong.gif"$[Strong (bold)]"');


So in your case it should look something like this:

  $GUIButtons ['youtube'] = array(622, '(:youtube ', ':)', 
'$[LetterString]',
'$GUIButtonDirUrlFmt/youtube.gif"$[youtube LetterString]"');