This gonna be a tough one guys... (I think)

I have created a secret page on my club website for displaying sensitive info to club admins.
Is it possible to add a text type chat box to that page so that all our admins can chat with each other.
At the moment we are all using Facebook private messaging but that is a pain in the ass, as we are missing so many messages.
Am I setting my aims too high?
Thanks in advance.