[pmwiki-users] auth condition in skins.php

[noskule]

hi list
The condition below works well in config.php but not in skins.php where 
I need it. Does anyone know way that is and how to solve it?
thank's for any hints.
nos


    if ( @$GLOBALS["PCache"][$GLOBALS["pagename"]]["=auth"]['admin'] ) {
        $contentbox_border = "1px sold red";
        $horizontallist_border = "1px sold red";
        $skinsection =  "1px sold red";
        }