function Montrerf1() {
document.getElementById("f1").style.visibility="visible";
document.getElementById("f2").style.visibility="hidden";
document.getElementById("f3").style.visibility="hidden";
document.getElementById("f4").style.visibility="hidden";
document.getElementById("f5").style.visibility="hidden";
}

function Montrerf2() {
document.getElementById("f2").style.visibility="visible";
document.getElementById("f1").style.visibility="hidden";
document.getElementById("f3").style.visibility="hidden";
document.getElementById("f4").style.visibility="hidden";
document.getElementById("f5").style.visibility="hidden";
}
function Montrerf3() {
document.getElementById("f2").style.visibility="hidden";
document.getElementById("f1").style.visibility="hidden";
document.getElementById("f3").style.visibility="visible";
document.getElementById("f4").style.visibility="hidden";
document.getElementById("f5").style.visibility="hidden";
}
function Montrerf4() {
document.getElementById("f2").style.visibility="hidden";
document.getElementById("f1").style.visibility="hidden";
document.getElementById("f3").style.visibility="hidden";
document.getElementById("f4").style.visibility="visible";
document.getElementById("f5").style.visibility="hidden";
}
function Montrerf5() {
document.getElementById("f2").style.visibility="hidden";
document.getElementById("f1").style.visibility="hidden";
document.getElementById("f3").style.visibility="hidden";
document.getElementById("f4").style.visibility="hidden";
document.getElementById("f5").style.visibility="visible";
}