Verify Estonian Isikukood With JavaScript

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Yesterday I had to verify Estonian national identification number with JavaScript. The formula is pretty simple. You just have to read it through couple of times to understand. If you need other languages Dmitri Smirnov has examples in PHP, Java and Ruby.

When asking a question include an URL to example page where the problem occurs. Even better is to make a Fiddle which demonstrates the problem. If you have longer code examples please use