function displayIntro()
{
    var loadingstatus = document.getElementById('loadingstatus');
    var logo = document.getElementById('logo');

    loadingstatus.style.display = 'none';
    loadingstatus.parentNode.removeChild(loadingstatus);
    logo.style.display = 'block';
}

function displayMenu()
{
    var logo = document.getElementById('logo');
    logo.parentNode.removeChild(logo);
    var intro = document.getElementById('intro'); 
    intro.onclick = null;
    var thanks = document.getElementById('thanks');
    thanks.style.display = 'block'; 
}