heres what i did
<?php
require "../Gallery/include/config.inc.php";
//Select random thumbnail file.
$link = mysql_connect($CONFIG['dbserver'], $CONFIG['dbuser'], $CONFIG['dbpass']) or die('Could not connect: ' . mysql_error());
mysql_select_db($CONFIG['dbname']) or die('Could not select database');
// Performing SQL query
$query = "SELECT * FROM ".$CONFIG['TABLE_PREFIX']."pictures, ".$CONFIG['TABLE_PREFIX']."albums WHERE ".$CONFIG['TABLE_PREFIX']."albums.aid = ".$CONFIG['TABLE_PREFIX']."pictures.aid and ".$CONFIG['TABLE_PREFIX']."albums.visibility ='0' ORDER BY rand() limit 1";
$result = mysql_query($query) or die('Query failed: ' . mysql_error());
$line = mysql_fetch_array($result, MYSQL_ASSOC);
$addrQuery = "SELECT value FROM ".$CONFIG['TABLE_PREFIX']."config WHERE name = 'ecards_more_pic_target'";
$pathQuery = "SELECT value FROM ".$CONFIG['TABLE_PREFIX']."config WHERE name = 'fullpath'";
$addrResult = mysql_query($addrQuery) or die('Query failed: ' . mysql_error());
$pathResult = mysql_query($pathQuery) or die('Query failed: ' . mysql_error());
$addrLine = mysql_fetch_row($addrResult);
$pathLine = mysql_fetch_row($pathResult);
mysql_free_result($result);
mysql_close($link);
echo "<a href=\"{$addrLine[0]}displayimage.php?pos=-{$line['pid']}\" target=\"_blank\"><img src=\"{$addrLine[0]}{$pathLine[0]}{$line['filepath']}thumb_{$line['filename']}\" alt=\"{$line['title']}\"border=0px></a>";
?>
just change the require line to the correct file