Thank you for this cool tool.
I thought that giving some more explanation to the users would help, so I extended your feedback-messages a little:
echo "<tr><td class="darktable" colspan="2"><form method="post" action="{$config['phpurl']}/mycookies.php"><input type="submit" name="submit" value="Expire Cookies" class="buttons" /><input type="hidden" name="doExpire" value="1" /><input type="hidden" name="Cat" value="$Cat" /></form>
[:"brown"]<p>Expiring (deleting) your board's cookies might be useful if you suspect that they are damaged and the board is malfunctioning.</p><p>Expiring those cookies will do NO harm at all, but this will log you out of the board. - Once you login and start using the board again, new fresh cookies will be set automatically.</p>[/]
</td></tr>$tbclose";
echo "<tr><td align="left" class="lighttable" colspan="2">You have no current cookies.[:"brown"] - This will log you out. Once you login and start using the board again, new cookies will be set automatically. [/]</td></tr>";
