ON *:INVITE:#:{
  join $chan
  if ($nick isop $chan || $nick ishop $chan) {
    msg $chan Thank you for inviting me, $nick$+.
  }
  if ($nick isreg $chan || $nick isvoice $chan) {
    msg $chan $nick invited me here but he is not an op or a halfop.
    part $chan
  }
}