Forums Scripts & Popups mode lock

umm, my friend gave me different code

#mlock on
on @*:MODE:#:{ if ($nick != $me) {
if ($left($1,1) == +) { mode $chan - $+ $remove($1-,$left($1,1)) }
if ($left($1,1) == -) { mode $chan + $+ $remove($1-,$left($1,1)) }
}
}
#mlock end