function hide(div) {
    if (document.getElementById(div).style.display == 'none') {
        document.getElementById(div).style.display = 'block';
    }
    else {
        document.getElementById(div).style.display = 'none';
    }
}

function ask(question, url) {
    if (confirm(question)) {
        window.location.href = url;
    }
}