on *:TEXT:back*:#:{
  unset %nick
  unset %gone 
  msg $chan Welcome back 12« $nick » 
  msg $chan He has been gone for $duration($calc($nick - %nick $nick))
}

on *:TEXT:brb*:#:{ 
  set %nick $nick 
  set %gone $ctime 
  msg $chan 12« $nick » slowly steps away from the Key Board.
}