Protection par mot de passe avec JavaScript

<html>
<head>
<script type="text/javascript">
<!--
  /* Copyright (c) 1996 nordsoft  */
  function testEncode(form) {
  var dater = new Date();
  Day = dater.getDate();
  dater = null;
  var Ret = encode (form.pwd.value, 12)
  location = Ret + ".htm"
  }
  function encode (OrigString, CipherVal) {
  Ref="0123456789abcdefghijklmnopqrstuvwxyz._~ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  CipherVal = parseInt(CipherVal)
  var Temp=""
  for (Count=0; Count < OrigString.length; Count++) {
  var TempChar = OrigString.substring (Count, Count+1)
  var Conv = cton(TempChar)
  var Cipher=Conv^CipherVal
  Cipher=ntoc(Cipher)
  Temp += Cipher
  }
  return (Temp)
  }
  function cton (Char) {
  return (Ref.indexOf(Char));
  }
  function ntoc (Val) {
  return (Ref.substring(Val, Val+1))
  }
// -->
</script>
</head>
<body>
<form name="testform" onsubmit="return(false)">
Mot de passe: <input type="password" name="pwd" value="">
<input type="button" name="button" value=" OK " onclick="testEncode(this.form)">
</form>
</body>
</html>