on *:text:!dehalfop *:#:{
  if ($nick isop $chan) {
    if ($2 == $null) { /mode $chan -h $nick }
    elseif ($2 == $me) { /mode $chan -h $nick }
    else { /mode $chan -h $2 }
  }
  elseif ($nick ishop $chan) {
    if ($2 isop $chan) { /notice $nick You can't dehalfop a full op! }
    elseif ($2 ishalfop $chan) { /notice $nick You can't dehalfop another halfop! }
    if ($2 == $null) { /mode $chan -h $nick }
    elseif ($2 == $me) { /mode $chan -h $nick }
} }