slightly different is this one, I got it from the board here before the fire
I wish I could remember who posted it..
Code:
alias ping .raw PRIVMSG $$1 : $+ $chr(1) $+ PING $ticks $+ $chr(1)
on *:CTCPREPLY:PING*: {
  var %ping = $calc(($ticks - $2) / 1000) Seconds
  echo -a $+($nick,'s) $1 is %ping
  .notice $nick Your $1 is %ping
  haltdef
}

make sure you dont have another "ping" alias anywhere