Javascript form validation library?

Hi,

Does anyone know of a javascript form validation library available (in other 
words, it contains all the code needed to check anything you tell it to)??  I 
just want a generic script which can give me the same kind of output as I've 
got at the moment (see http://www.sendcard.f2s.com/sendcard3 for a demo - 
miss out some entries on the form and see how it goes) but will also validate 
email addresses.

Thanks,
Peter.

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