function montrer(id) {

    //var ul = document.getElementById(id);
    id.style.display = 'block';
}
function cacher(id) {
   //var ul = document.getElementById(id);
    id.style.display = 'none';

}


function montrerFromId(id) {

    var object = document.getElementById(id);
    object.style.display = 'block';
}
function cacherFromId(id) {
    var object = document.getElementById(id);
    object.style.display = 'none';

}