Only allow full-size viewing to specific user groups

[frankae]

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if (!USER_ID) cpg_die(ERROR, 'Your message to invite visitors to register to see the big pic', __FILE__, __LINE__);

is given somewhere else in the forum to allow only registered users to view full-size pictures. I would like to know how to only allow users of specific user groups to do so.

[Joachim Müller]

http://forum.coppermine-gallery.net/index.php?topic=338

[frankae]

unfortunately, I could not find an answer in the link you provided.

I tried using:

Code Select Expand

if ($USER_GROUP != 'Known Users' or 'Administrators') cpg_die(ERROR, 'You need to have at least Known User status to see the big picture.', __FILE__, __LINE__);

and I do have both of these group names in effect. The result is that the error is thrown for everyone. What am I doing wrong?