I had a /silence script before that uses variables and could never get it to work when silencing two nick's at once.. It would cause an error in the script.. so decided to make a silence script using .ini files.

Syntax: /sil

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Silence script by GrimReaper       ;;
;; irc.GeekShed.net chan: #hell       ;;
;; irc.SassIRC.com chan: #SassIRC.com ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

alias sil {
  if ($me isop $chan) || ($me ishop $chan) {
    if (!$1) || (!$2) { echo -at * Error: Incorrect syntax used, /sil <nick> <timer in minutes> }
    elseif ($1) || ($2) {
      mode $chan +bb ~q: $+ $address($1,2) ~n: $+ $address($1,2)
      writeini Silence.ini $$1 chan $active
      if ($$1 ishop $active) { writeini Silence.ini $1 status HOP | mode $active -h $1 }
      if ($$1 isvoice $active) { writeini Silence.ini $1 status VOP | mode $active -v $1 }
      $iif($$1 isreg $active,writeini Silence.ini $1 status REG)
      .timer 1 $calc($2 * 60) desil $1 $address($1,2) $chan
    }
  }
}

on *:JOIN:#: {
  if ($ini(Silence.ini,$nick,chan)) {
    if ($readini(Silence.ini,$nick,status) == HOP) {
      mode $chan -h $nick
    }
    elseif ($readini(Silence.ini,$nick,status) == VOP) {
      mode $chan -v $nick
    }
  }
}

alias -l desil {
  if ($1 ison $3) {
    if ($readini(Silence.ini,$1,status) == HOP) { mode $$3 +h $1 | remini Silence.ini $1 }
    if ($readini(Silence.ini,$1,status) == VOP) { mode $$3 +v $1 | remini Silence.ini $1 }
    mode $3 -bb ~q: $+ $2 ~n: $+ $2
  }
  elseif ($1 !ison $3) { mode $3 -bb ~q: $+ $2 ~n: $+ $2 | remini Silence.ini $1 }
}