function danke(beitrag) {
    with (document.getElementById(beitrag))
    {
        with (elements['eins'])         {
            value = 'Danke';
            disabled=true;
            style.backgroundColor = "#006600";
        }
        with (elements['zwei'])         {
            value = 'Danke';
            disabled=true;
            style.backgroundColor = "#006600";
        }
        with (elements['drei'])         {
            value = 'Danke';
            disabled=true;
            style.backgroundColor = "#006600";
        }
        with (elements['vier'])         {
            value = 'Danke';
            disabled=true;
            style.backgroundColor = "#006600";
        }
    }
return;
}