Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/97150ae226548689#
We've developed FormManager javascript class, that can be used to create
forms, that are validated on the fly using ajax.
However it's only used in modern-store theme that isn't even released.
I'm proposing to use it also in "advanced" theme, that is widely used.
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Best Regards,