<!--

function getID(id) {
    if (document.getElementById(id) && typeof(document.getElementById(id))=='object') { return document.getElementById(id); }
    return false;
}

function isEmail(email) {
    var a = false;
    var res = false;
    if(typeof(RegExp) == 'function') {
        var b = new RegExp('abc');
        if(b.test('abc') == true){a = true;}
    }
    if(a == true) {
        reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+
                        '(\\@)([a-zA-Z0-9\\-\\.]+)'+
                        '(\\.)([a-zA-Z]{2,4})$');
        res = (reg.test(email));
    } else {
        res = (email.search('@') >= 1 && email.lastIndexOf('.') > s.search('@') && email.lastIndexOf('.') >= email.length-5)
    }
    return(res);
}

function checkEmail(id) {
    var element = getID(id);
    var value = element.value;
    var result = isEmail(value);
    if (!result) {
        alert('Bitte geben Sie eine gültige Email Adresse ein.');
    }
    return result;
}

-->