function showMessageImage()
{
removeIndexElements();
document.getElementById("message_img").style.display="block";
}

function showIndexVideo()
{
removeIndexElements();
document.getElementById("index_video").style.display="block";
}

function showBumperVideo()
{
removeIndexElements();
document.getElementById("bumper_video").style.display="block";
}

function showAnniversaryVideo()
{
removeIndexElements();
document.getElementById("anniversary_video").style.display="block";
}

function removeIndexElements()
{
document.getElementById("message_img").style.display="none";
document.getElementById("index_video").style.display="none";
document.getElementById("anniversary_video").style.display="none";
document.getElementById("bumper_video").style.display="none";
}