function getEl(id) {
    element = document.getElementById(id);
    return element;
}

function hideEl(id) {
    var element = getEl(id);
    element.style.display = 'none';
}

function showEl(id) {
    var element = getEl(id);
    element.style.display = '';
}

function ShowHide(sid, last) {
    //var p = document.images['plus_minus_' + sid];
    var el = 'info_' + sid;
    if(getEl(el).style.display == 'none') {
        var class_name = (last == true) ? 'meno_info ultimo' : 'meno_info';
        showEl(el);
        getEl('p_' + sid).className = class_name;
        getEl('href_' + sid).innerHTML = '-';
    } else {
        var class_name = (last == true) ? 'piu_info ultimo' : 'piu_info';
        hideEl(el);
        getEl('p_' + sid).className = class_name;
        getEl('href_' + sid).innerHTML = '+';
    }
}
//-->