[zlos]

include your /forum/global.php into the script and inspect $vbulletin->userinfo array.

There you will see quite a loty of info about user being logged int.

--------------- Added [DATE]1296124237[/DATE] at [TIME]1296124237[/TIME] ---------------

Try something like this:

PHP Code:

<?
require_once("/path/to/your/forum/global.php");

//assuming admin has userid = 1
if($vbulletin->userinfo['userid'] == 1) {
    echo "<pre>";
    print_r($vbulletin->userinfo);
    echo "</pre>";
} else {
    echo "Sorry. Admin only."
}
?>