<script type = "text/javascript">
<!--
var numbers;
numbers = window.prompt ( "Enter four digits to decrypt: ", "0" );
var char1 = (numbers.charAt(0));
var char2 = (numbers.charAt(1));
var char3 = (numbers.charAt(2));
var char4 = (numbers.charAt(3));
var first = parseInt( char1, 10 );
var second = parseInt( char2, 10 );
var third = parseInt( char3, 10 );
var fourth = parseInt( char4, 10 );
if (first < 7 )
first = (first + 10) - 7;
else
first = first - 7;
if (second < 7 )
second = (second + 10) - 7;
else
second = second - 7;
if (third < 7 )
third = (third + 10) - 7;
else
third = third - 7;
if (fourth < 7 )
fourth = (fourth + 10) - 7;
else
fourth = fourth - 7;
document.write( char1 + char2 + char3 + char4 + ": will decrypt to: " );
document.write( "" + third + "" + fourth + "" + first + "" + second + "" );
//-->
</script>
</head>
<body>
<p>Reload page to run the script again</p>
</body>
</html>
</div>
</div>
</td>
</tr>
</table>
</body>
</html>