function cache1() {          
document.getElementById("note1").style.visibility="hidden";
}
function montre1() { 
document.getElementById("note1").style.visibility="visible";
}
function cache2() {          
document.getElementById("note2").style.visibility="hidden";
}
function montre2() { 
document.getElementById("note2").style.visibility="visible";
}
function cache3() {          
document.getElementById("note3").style.visibility="hidden";
}
function montre3() { 
document.getElementById("note3").style.visibility="visible";
}