This is my own little away script.
You can put it in your aliases area.

; Command To Use Away Script: /aw
; You May Edit This Script To If You Want.
/aw {
/away $?="Away Message:"
/say $?
/nick $me $+ -away
}

So that was my script.
/away $?="Away Message:" will ask the user what message they want to apear in all channels/msgs/dccs/ect.
/say $? will say your away message to other users in the channels/msgs/dccs/ect.
/nick $me $+ -away will change your nick.
example: *Nickname Changed From gabriel To gabriel-away