When you're creating the message insert an emoticon

then click on the emoticon. You should get a little text-box like structure.
Then check the "Use HTML to create your page" box at the bottom of the message box

. You should then see some text. Look for where it says
"<IMG height=19" - leave a space after the "19" and type in: alt="put your message here". Then uncheck the "Use HTML to create your page" box at the bottom and continue on with your message.
Incidentally, you can change the height number - mine are 15 instead of 19 - but if you do remember to also change the width number

.
Easy eh? - Well I never promised you a

John