function showbienvenue()
{
document.getElementById('bienvenue').style.display='block';
document.getElementById('staff').style.display='none';
document.getElementById('partner').style.display='none';
document.getElementById('credits').style.display='none';
}
function showstaff()
{
document.getElementById('bienvenue').style.display='none';
document.getElementById('staff').style.display='block';
document.getElementById('partner').style.display='none';
document.getElementById('credits').style.display='none';
}
function showpartner()
{
document.getElementById('bienvenue').style.display='none';
document.getElementById('staff').style.display='none';
document.getElementById('partner').style.display='block';
document.getElementById('credits').style.display='none';
}
function showcredits()
{
document.getElementById('bienvenue').style.display='none';
document.getElementById('staff').style.display='none';
document.getElementById('partner').style.display='none';
document.getElementById('credits').style.display='block';
}