[jQuery] Validation Demo Question (bassistance.de)

[jQuery] Validation Demo Question (bassistance.de)


Hi All,
Im new to jQuery and I found it very powerfull tool and I really like
it's validation plugin. I just have a question on the demo I found in
the below URL:
http://jquery.bassistance.de/validate/demo/errorcontainer-demo.html
My questions is, how can I add a custom validation there. Example, I
want the form to accept only email addresses that are not yet existing
on the database and how can I add a custom message to the error
container (class="container").
I want to validate email address to be:
1. required [required: true] - display message "Please enter an Email
Address."
2. valid email [email: true] - display message "Please enter a valid
email."
3. Email Address exists: If Exists - display additional message "Email
address already exists."
All additional messages will be placed at the same error contatiner
(.container > ol > li)
Hoping for your help.
Thanks,
Nimrod