chrsr

validatejs = new FormValidator(form, rules, function(errors, events) {
    if (errors.length > 0) {
        // show errors
        event.preventDefault(); // + ie6 equivalent
    } else {
        // do stuff before form submission
        return true;
    }
});

chrsr

input.addEventListener('blur', function () {
    var errors = document.getElementById("errors");
    validator.validateField(this);
    errors.innerHTML = validator.errors[0] || "";
});

chrsr

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Mathieu 'p01' Henri http://www.p01.org/releases/

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE