on $*:text:/^(brb|away)/Si:#P.C: {
  /msg $chan 6  $nick  will be right back. He had to go for $&
    this reason: 12 $2-
  /set -c %awayjos 1
}
on $*:text:/^(bk|back)/Si:#P.C: {
  /msg $chan $nick is back, he was away for $+(,%away,) seconds. $&
    Welcome back $nick
  /unset %awayjos
}