on *:text:!chanban*:#: { 
  if ($nick isop $chan || $nick ishop $chan) { 
    set %chanban [ $+ [ $2 ] ] $2
    /mode # -b ~c:%chanban
  } 
}

on *:text:!dechanban*:#: { 
  if ($nick isop $chan || $nick ishop $chan) { 
     unset $($+(%,chanban,$2),2)
    /mode # -b ~c:%debanchan
  } 
}