May I send HTML code along with my message?
No. You may do it only in the text field of the message (the big space). Who mantains the script may allow or not the use of HTML code to some users. For those not allowed, everything between < and > is ignored. Otherwise, everything will be visible on the page where your message is. Trying is free..
Why does a colon appear when I answer a message in the section about message sending?
The colon appears in the mailbox when you try to answer to a message to point that these lines were written by the first message's author, like a citation. The debate area manager can decide whether the answer to a message contain the message itself.
I can't see my message! Where is it?
Your message doesn't appear because your browser didn't put the page where the new message stays yet. Perhaps it looked for this page in the local cache. All you have to do is to reload the page.
Where can I find such scripts?
The scripts were written in Perl by Matt Wright. They are free, and you may find these and much more at http://worldwidemart.com/scripts/