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As far as i know, If there is clientValidationFunction in a customer validator. it will not let the post back happen until the value is valid. So if there is clientValidationFunction already, it is not needed to have a ServerValidate event right ?
You should never rely on client-side code alone to perform validation. The client might have scripting disabled, so your validation code may not run at all. Moreover, client-side code can also be circumvented in many other ways.
Client-side validation is useful to avoid a round-trip to the server when a field is invalid, but you still have to perform server-side validation to actually ensure the client has sent valid data.