function montrerCacherDiv(nom) {

    var objConteneur = document.getElementById("div" + nom);
    var objTexte = document.getElementById("txt" + nom);
    var objImg = document.getElementById("img" + nom);
    var objH1 = document.getElementById("h1" + nom);

    if (objConteneur.style.display == "block") {
        objConteneur.style.display = "none";
        objTexte.innerHTML = "Lire";
        objH1.style.borderBottom = "0 none";
        objImg.src = "/images/fleche_boite_show.gif";
    } else {
        objConteneur.style.display = "block";
        objTexte.innerHTML = "Fermer";
        objH1.style.borderBottom = "1px solid #666666";
        objImg.src = "/images/fleche_boite_hide.gif";
    }

}