Try this:
Code:
ON *:TEXT:!off*:*: { 
  if ($nick isop $chan) {
    set % $+ $chan off
  }
}
ON *:TEXT:!on*:*: { 
  if ($nick isop $chan) {
    unset % $+ $chan
  }
}
on !*:TEXT:*example*:#: {
  if ($nick !isop $chan) { 
    if ($($+(%, $chan), 2) == off) {
    ban $($+(-ku,1800)) $chan $nick 3 banned!
    }
  }
}