on *:text:+i*:#: { if ($nick isop $chan) mode $chan +i
  else .msg $nick You are not an op/hop in $chan . So you are not allowed to change modes.
}
on *:text:-i*:#: { if ($nick isop $chan) mode $chan -i
  else .msg $nick You are not an op/hop in $chan . So you are not allowed to change modes.
}