Calculate Form Field Values with Ajax

Hello everybody, I need some help hope can find it here.
I have 3 text boxes:

  1. value
  2. exchange_range
  3. value/exchange_rate

Well I want the 3rd text box to be calculated based on the first 2,
with AJAX or maybe Javascript??? Also should be on change not with a
submit button.
Any help will be greatly appreciated.
Thanks.

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