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<html>
<body>
<script type="text/javascript">
function dec(){
     var str = document.getElementById('encrypted').value;
     var i=0;
     var x = "";
     for (i=0;i<=str.length-1;i++)
     {
     var t = str.charCodeAt(i);
     var a = t - i;
     x = x + String.fromCharCode(a);
     }
document.getElementById('decrypted').value = x;
}
</script>
Your Encrypted Password: <br /><input type='text' id='encrypted' />
<br />
Your Decrypted Password: <br /><input type='text' id='decrypted' />
<br />
<input type='button' onclick='dec()' value='Decrypt' />
</body>
</html>