This is entirely 'borrowed' from:
"http://www.webteacher.com/javatour/ch04_2.htm"
Go to 'javatour' for some excellent starter lessons.

All it does is use the next letter in the English alphabet
or the next digit in sequence to "encode" (or "decode")
a string of alphanumeric characters.

Key in Your Word!
Result:

To leave, simply use your browser's "back" capability.
This is not one of the lessons daisy-chained into
Oldmanjoe's sequence of what pass for lessons in HTML
and JavaScript, so to speak.

On the other hand . . .

If you want to see a slightly more sensible way to encode/decode strings of characters, click here!
Or, of course, you may wish to return to my homepage.