Simple AJAX form validation

/**
Ajax form validation
Created by Konyakov Artem
http://konyakov.ru/contacts/
19.12.2006
**/

var formValidationMasks = new Array();
formValidationMasks['orderBook'] = /^[0-9]{1,4}$/gi;
formValidationMasks['orderBookDvd'] = /^[0-9]{1,4}$/gi;
// formValidationMasks['email'] = /\b[A-Z0-9._-]+@[A-Z0-9.-]+\.[A-Z]{2,6}\b/gi;
var formElementArray = new Array();

function addEvent(obj, type, fn) {
    if (obj.attachEvent) {
        obj['e' + type + fn] = fn;
        obj[type + fn] = function () {
            obj['e' + type + fn](window.event);
        }
        obj.attachEvent('on' + type, obj[type + fn]);
    } else obj.addEventListener(type, fn, false);
}

function removeEvent(obj, type, fn) {
    if (obj.detachEvent) {
        obj.detachEvent('on' + type, obj[type + fn]);
        obj[type + fn] = null;
    } else obj.removeEventListener(type, fn, false);
}


function validateInput(e, inputObj) {
    if (!inputObj) inputObj = this;
    var inputValidates = true;

    if (formElementArray[inputObj.name]['required'] && inputObj.tagName == 'INPUT' && inputObj.value.length == 0) inputValidates = false;
    if (formElementArray[inputObj.name]['required'] && inputObj.tagName == 'SELECT' && inputObj.selectedIndex == 0) {
        inputValidates = false;
    }
    if (formElementArray[inputObj.name]['mask'] && !inputObj.value.match(formValidationMasks[formElementArray[inputObj.name]['mask']])) inputValidates = false;

    if (formElementArray[inputObj.name]['freemask']) {
        var tmpMask = formElementArray[inputObj.name]['freemask'];
        tmpMask = tmpMask.replace(/-/g, '\\-');
        tmpMask = tmpMask.replace(/S/g, '[A-Z]');
        tmpMask = tmpMask.replace(/N/g, '[0-9]');
        tmpMask = eval("/^" + tmpMask + "$/gi");
        if (!inputObj.value.match(tmpMask)) inputValidates = false
    }

    if (formElementArray[inputObj.name]['regexpPattern']) {
        var tmpMask = eval(formElementArray[inputObj.name]['regexpPattern']);
        if (!inputObj.value.match(tmpMask)) inputValidates = false
    }
    if (!formElementArray[inputObj.name]['required'] && inputObj.value.length == 0 && inputObj.tagName == 'INPUT') inputValidates = true;

    if (inputValidates) {
        inputObj.parentNode.className = 'validInput';
    } else {
        inputObj.parentNode.className = 'invalidInput'
    }
}

function isFormValid() {
    var divs = document.getElementsByTagName('DIV');
    for (var no = 0; no < divs.length; no++) {
        if (divs[no].className == 'invalidInput') return false;
    }
    return true;
}


function initFormValidation() {
    var inputFields = document.getElementsByTagName('INPUT');
    var selectBoxes = document.getElementsByTagName('SELECT');

    var inputs = new Array();


    for (var no = 0; no < inputFields.length; no++) {
        inputs[inputs.length] = inputFields[no];

    }
    for (var no = 0; no < selectBoxes.length; no++) {
        inputs[inputs.length] = selectBoxes[no];

    }

    for (var no = 0; no < inputs.length; no++) {
        var required = inputs[no].getAttribute('required');
        if (!required) required = inputs[no].required;

        var mask = inputs[no].getAttribute('mask');
        if (!mask) mask = inputs[no].mask;

        var freemask = inputs[no].getAttribute('freemask');
        if (!freemask) freemask = inputs[no].freemask;

        var regexpPattern = inputs[no].getAttribute('regexpPattern');
        if (!regexpPattern) regexpPattern = inputs[no].regexpPattern;

        var div = document.createElement('DIV');
        div.className = 'invalidInput';
        inputs[no].parentNode.insertBefore(div, inputs[no]);
        div.appendChild(inputs[no]);
        div.style.width = inputs[no].offsetWidth + 'px';

        addEvent(inputs[no], 'blur', validateInput);
        addEvent(inputs[no], 'change', validateInput);
        addEvent(inputs[no], 'paste', validateInput);
        addEvent(inputs[no], 'keyup', validateInput);

        formElementArray[inputs[no].name] = new Array();
        formElementArray[inputs[no].name]['mask'] = mask;
        formElementArray[inputs[no].name]['freemask'] = freemask;
        formElementArray[inputs[no].name]['required'] = required;
        formElementArray[inputs[no].name]['regexpPattern'] = regexpPattern;

        validateInput(false, inputs[no]);

    }
}
window.onload = initFormValidation;