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Live Validation

A very neat solution to javascript validation..

"LiveValidation is a small open source javascript library for making
client-side validation quick, easy, and powerful. It comprises of two
main parts. Firstly, it provides developers with a rich set of core
validation methods, which can also be used outside the context of
forms. Secondly, it provides your visitors with real-time validation
information as they fill out forms, helping them to get it right first
time, making the forms easier, quicker and less daunting to complete"

http://www.livevalidation.com/