function ToggleMenu(objId) {
    var menuObj = document.getElementById(objId + '_options');
    var imgObj  = document.getElementById(objId + '_image');
    if (menuObj) {
        if (menuObj.style.display == 'block') {
            menuObj.style.display       = 'none';
            menuObj.style.visibility    = 'hidden';
            if (imgObj) imgObj.src = '/orc_template/images/explorer_plus.gif';
        } else {
            menuObj.style.display       = 'block';
            menuObj.style.visibility    = 'visible';
            if (imgObj) imgObj.src = '/orc_template/images/explorer_minus.gif';
            
            var images = menuObj.getElementsByTagName('img');
            for (i = 0; i < images.length; i++) {
                images[i].src = images[i].src;
            }
        }
    }
    
    return false;
}