function showpagebienvenue() { document.getElementById('pagebienvenue').style.display='block'; document.getElementById('pagemakers').style.display='none';
document.getElementById('pageconcours').style.display='none';
document.getElementById('pageamis').style.display='none'; document.getElementById('pagecredits').style.display='none';} 

function showpagemakers() { document.getElementById('pagemakers').style.display='block'; document.getElementById('pagebienvenue').style.display='none';
document.getElementById('pageconcours').style.display='none';
document.getElementById('pageamis').style.display='none'; document.getElementById('pagecredits').style.display='none';} 

function showpageconcours() { document.getElementById('pageconcours').style.display='block'; document.getElementById('pageamis').style.display='none';
document.getElementById('pagecredits').style.display='none';
document.getElementById('pagebienvenue').style.display='none'; document.getElementById('pagemakers').style.display='none';} 

function showpageamis() { document.getElementById('pageamis').style.display='block'; document.getElementById('pagecredits').style.display='none';
document.getElementById('pagebienvenue').style.display='none';
document.getElementById('pagemakers').style.display='none'; document.getElementById('pageconcours').style.display='none';} 

function showpagecredits() { document.getElementById('pagecredits').style.display='block'; document.getElementById('pagebienvenue').style.display='none';
document.getElementById('pagemakers').style.display='none';
document.getElementById('pageconcours').style.display='none'; document.getElementById('pageamis').style.display='none';}