Code: 
on *:TEXT:!+i:#:{ 
  if ($nick isop $chan || $nick ishop $chan) { 
    /mode $chan +i 
  } 
  else { notice $nick You can't use this commands! } 
} 

on *:TEXT:!-i:#:{ 
if ($nick isop $chan || $nick ishop $chan) { 
  /mode $chan -i 
} 
else { notice $nick You can't use this commands! } 
}