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

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

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

function showSpecialVideo()
{
removeIndexElements();
document.getElementById("special_video").style.display="block";
}

function what_we_are_about()
{
removeIndexElements();
document.getElementById("about_video").style.display="block";
}

function removeIndexElements()
{
document.getElementById("centerMessageImg").style.display="none";
document.getElementById("index_video").style.display="none";
document.getElementById("special_video").style.display="none";
document.getElementById("bumper_video").style.display="none";
document.getElementById("about_video").style.display="none";
}