function validateEmail(element_id, message) {
    var reFormat=/^.+@.+\..{2,4}$/;
    var reInvalidChars=/[\(\)\<\>\,\;\:\\\/\"\[\]]/;
    val = $(element_id).value;
    if (reFormat.test(val) && !(reInvalidChars.test(val)))
    {
        return true;
    }
    else {
        alert(message);
        return false;
    }
}