function hideShow(id) {
    if (document.getElementById(id).style.display == 'none')
    {
        document.getElementById(id).style.display = 'block';
        chevron = document.getElementById('opener_button');
        if (chevron != null)
            chevron.src = "/rnt/rnw/img/admin/arrows_up.gif";
    }
    else if (document.getElementById(id).style.display == 'block')
    {
        document.getElementById(id).style.display = 'none';
        chevron = document.getElementById('opener_button');
        if (chevron != null)
            chevron.src = "/rnt/rnw/img/admin/arrows_down.gif";
    }
}