function activateMenuTree(lastElement){
    var activePath = lastElement.split('_');
    var prefix = '';
    for (i in activePath) {
        if (prefix !== '') {
            prefix += '_' + activePath[i];
        }
        else {
            prefix += activePath[i];
            continue;
        }
        element = document.getElementById(prefix);
        if (element) {
            element.parentNode.className = "active";
        }
        if (element) {
            element.style.display = 'block';
            for (i = 0; i < element.childNodes.length; i++) {
                if (element.childNodes[i].nodeType == 1) {
                    element.childNodes[i].className = "subitem";
                }
            }
        }
    }
}