Shoutbox

I tested the script. I find everything is brilliant, however, when I used an account (that I didn't allow) and sign out of it, the nick apparently didn't change.
Any comment that will change back to the nick that it was used before? And whenever I deleted the space in "what to set for guest name", and clicked ok, I went back the blank changed to 'false', thus the change in nick, without changing back when it's automatically sign out.
Any ideas what is that so?

EDIT: The script rocks though.