keyup help

[scriptless]

Okay I am working on a "-punch" system that ruuns smoothly and effeciently. There is only 1 problem I am having. Well 2 kinda. Lets start here.

NPC Code:

---

//#CLIENTSIDE

function onCreated()

{

  disableweapons();

}



function onActionPunchHurt()

{

  if (ispaused)

  {

    //blah

  }

    else

  {

    player.hearts -= 0.5;

    player.chat = "Ouch!";

    setani( "idle", NULL);

    setani( "hurt", NULL);

  }

}



function onKeyPressed(code,key)

{

  if ( player.ani != "swim")

  {

    if ( key == "s" )

    {

      if ( player.freezetime < 0 )

      {

        ar = {player.x + (vecx(player.dir) * 2) + 1.5, player.y + (vecy(player.dir) * 2) + 1.8};

        triggeraction( ar[0], ar[1], "PunchHurt", player.account, player.nick, player.guild);

        setani( "punch-right", null);

        freezeplayer(.4);

        sleep(.3);

        setani( "idle" , null );

      }

    }

  }

}

---

Origonally my problems were if u held "tab" and "s" u would punch really fast. Now it seems u can just hold "s" to punch repeatedly. How can I do a "loop-less" keyup check? Any suggestions? I only want it to punch once even if I hold "s" down. I tried adding a while loop at the end to basicallt loop as long as the keydown2 says its still pressed.. bug all I got was lag.