function hide1() {
document.getElementById("boutontableau").style.visibility="hidden";
}


function show1() {
document.getElementById("boutontableau").style.visibility="visible";
}

function hide2() {
document.getElementById("boutonfairepart").style.visibility="hidden";
}


function show2() {
document.getElementById("boutonfairepart").style.visibility="visible";
}

function hide4() {
document.getElementById("boutonblabla").style.visibility="hidden";
}


function show4() {
document.getElementById("boutonblabla").style.visibility="visible";
}

function hide5() {
document.getElementById("boutonprojets").style.visibility="hidden";
}


function show5() {
document.getElementById("boutonprojets").style.visibility="visible";
}

function hide6() {
document.getElementById("boutonillustration").style.visibility="hidden";
}


function show6() {
document.getElementById("boutonillustration").style.visibility="visible";
}