function isEmail(emailAddress) {
        emailAddressValue = emailAddress.value.toLowerCase();
        var countryTLDs = /^(ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cat|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)$/;
        var gTLDs = /^(aero|biz|cat|com|coop|edu|gov|info|int|mil|museum|name|net|org|jobs)$/;
        var basicAddress = /^(.+)@(.+)$/;
        var specialChars = '\\(\\)><@,;:\\\\\\\"\\.\\[\\]';
        var validChars = '\[^\\s' + specialChars + '\]';
        var validCharset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\'-_.';
        var quotedUser = '(\"[^\"]*\")';
        var atom = validChars + '+';
        var word = '(' + atom + '|' + quotedUser + ')';
        var validUser = new RegExp('^' + word + '(\.' + word + ')*$');
        var symDomain = new RegExp('^' + atom + '(\.' + atom + ')*$');
        var matchArray = emailAddressValue.match(basicAddress);
        if (emailAddress.value == '' || emailAddress == null) {
            return true;
        }
        if (matchArray == null) {
            alert('L\'adresse Email semble incorrecte,\nveuillez vérifier la syntaxe.');
            emailAddress.focus();
            return false;
        } else {
            var user = matchArray[1];
            var domain = matchArray[2];
            for (i = 0; i < user.length; i++) {
                if (validCharset.indexOf(user.charAt(i)) == -1) {
                    alert('L\'adresse Email contient des caractères invalides,\nveuillez vérifier la partie avant l\'arobase.');
                    emailAddress.focus();
                    return false;
                }
            }
            for (i = 0; i < domain.length; i++) {
                if (validCharset.indexOf(domain.charAt(i)) == -1) {
                    alert('L\'adresse Email contient des caractères invalides,\nveuillez vérifier la partie après l\'arobase.');
                    emailAddress.focus();
                    return false;
                }
            }
            if (user.match(validUser) == null) {
                alert('L\'adresse Email semble incorrecte,\nveuillez vérifier la partie avant l\'arobase.');
                emailAddress.focus();
                return false;
            }
            var atomPat = new RegExp('^' + atom + '$');
            var domArr = domain.split('.');
            var len = domArr.length;
            for (i = 0; i < len; i++) {
                if (domArr[i].search(atomPat) == -1) {
                    alert('L\'adresse Email semble incorrecte,\nveuillez vérifier la partie après l\'arobase.');
                    emailAddress.focus();
                    return false;
                }
            }
            if ((domArr[domArr.length - 1].length == 2) && (domArr[domArr.length - 1].search(countryTLDs) == -1)) {
                alert('L\'adresse Email semble incorrecte,\nveuillez vérifier le suffixe du domaine.');
                emailAddress.focus();
                return false;
            }
            if ((domArr[domArr.length - 1].length > 2) && (domArr[domArr.length - 1].search(gTLDs) == -1)) {
                alert('L\'adresse Email semble incorrecte,\nveuillez vérifier le suffixe du domaine.');
                emailAddress.focus();
                return false;
            }
            if ((domArr[domArr.length - 1].length < 2) || (domArr[domArr.length - 1].length > 6)) {
                alert('L\'adresse Email semble incorrecte,\nveuillez vérifier le suffixe du domaine.');
                emailAddress.focus();
                return false;
            }
            if (len < 2) {
                alert('L\'adresse Email semble incorrecte.');
                emailAddress.focus();
                return false;
            }
        }
        return true;
    }
    function mandatoryRadio(radio, fieldName) {
        var radioValue = null;
        for (var i = 0; i < radio.length; i++) {
            if (radio[i].checked) {
                radioValue = radio[i].value;
                break;
            }
        }
        if (radioValue == null) {
            alert('Veuillez sélectionner votre ' + fieldName + '.');
            radio[0].focus();
            return false;
        } else {
            return true;
        }
    }
    String.prototype.trim = function() {
        return this.replace(/^\s*(\b.*\b|)\s*$/, "$1");
    }
    function mandatoryText(input, fieldName) {
        if (input.value.trim() == '' || input == null) {
            alert('Veuillez saisir ' + fieldName + '.');
            input.focus();
            return false;
        } else {
            return true;
        }
    }
    function validForm() {
        if (!mandatoryText(document.getElementById('EMAIL_FIELD'), 'Email Address')) return;
        if (!isEmail(document.getElementById('EMAIL_FIELD'))) return;
        if (!mandatoryText(document.getElementById('FIRSTNAME_FIELD'), 'Pre Nom')) return;
        if (!mandatoryRadio(document.getElementById('emvForm').GENDER_FIELD, 'Gender')) return;
        document.getElementById('emvForm').submit();
    }