function doChallengeResponse() {
	md5str = MD5(document.login.password.value);
    str = document.login.username.value + ":" +
          md5str + ":" +
          document.login.challenge.value;

    document.login.response.value = MD5(str);
    document.login.password.value = "";
    document.login.submit();
  }

if(window.Event) document.captureEvents(Event.KEYPRESS);
document.onkeypress=dokey;
var doenter=true;
function dokey(e) {
var key="";
        if(window.Event) key=e.which;
        else key=event.keyCode;
        if((key==13)&&(doenter==true))
             doChallengeResponse();
}