How do I encrypt a number from 1 to 1000 to a 4 digit hex code?

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From: ffrugone@xxxxxxxxx
Date: 6 Aug 2006 18:40:27 -0700

I need to create a method for a web page I'm building that encrypts a
number from 1 to 1000 into a 4 digit hex code. I know nothing about
cryptography. Can anyone steer me in the right direction?

.

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