Automatic Phone Number Shifting + Javascript

What is it called when you enter in a phone number in the contact form and after you enter in 3 numbers in the first box, it automaticlally shifts to the 2nd box, and then the final box.

(xxx) xxx - xxxx

Can you help me find the Javascript code for this?
RobWellsMcAsked:
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RobWellsMcAuthor Commented:
Here's the answer - Auto Tab forms - phone number entry...

http://javascript.internet.com/forms/auto-tab.html

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RobWellsMcAuthor Commented:
Great website full of form scripts like the auto tab script above:

 http://javascript.internet.com/forms/
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