<script type="text/javascript">
jQuery(document).ready(function($){
    $('#co-payment-form dt input').on('click', function(){
        if($(this).val() == 'paytabs_server'){
            $(this).next().append('<span id="paytab_message">Please make sure to enable Cookies from your browser!</span>')
        }else{
            $('#paytab_message').remove();
        }
    });
});