function toggleThis(a) {
    var _li = a.parentNode;
    while (_li.tagName != 'LI') _li = _li.parentNode;
    var _ul = _li.getElementsByTagName('UL')[0];
    if (!_ul.toggled) {
        var _cls_li = _li.getAttribute('class') || _li.getAttribute('className');
        if (_cls_li.indexOf('active') >= 0) _ul.style.display = '';
        else _ul.style.display = 'none';
        _ul.toggled = true;
    }
    var _display = _ul.style.display;
    _ul.style.display = _display == 'none' ? 'block' : 'none';
    a.innerHTML = _display == 'none' ? '+' : '-';
    var _div = a.parentNode;
    var _cls_div=_div.getAttribute('class') || _div.getAttribute('className');
    _div.setAttribute('class', _cls_div == 'plus' ? 'minus' : 'plus');
    
}