It's very easy to add more servers to the "Up" list. Just copy and paste the up image link and add the server name to it.
I added Splitpaw and Runnyeye to it and have it displayed on my guilds page
http://www.truewatchguild.co.uk/forum/portal.php
I only cared about 3 of the servers (Splitpaw, runnyeye and Antonius) so I sized the box to show just those 3....but now that some servers are down, I can see it needs some editing so it fits