function Login(){
var done=0;
var username=document.login.username.value;
username=username.toLowerCase();
var password=document.login.password.value;
password=password.toLowerCase();
<!--Remplacer ci-dessous  les noms de membres et mot de passe-->
if (username=="jacques" && password=="sesame") { window.location="bienvenue.html"; done=1; }
if (username=="lagopède" && password=="3856") { window.location="bienvenue.html"; done=1; }
if (username=="st.av" && password=="st.av") { window.location="bienvenue.html"; done=1; }
if (username=="majale" && password=="7952") { window.location="bienvenue.html"; done=1; }
if (done==0) { alert("Login invalide"); }
}