function montre(id) {
          if (document.getElementById) {
                  document.getElementById(id).style.display="block";
                } else if (document.all) {
                  document.all[id].style.display="block";
                } else if (document.layers) {
                  document.layers[id].display="block";
                } }

 function cache(id) {
          if (document.getElementById) {
                  document.getElementById(id).style.display="none";
                } else if (document.all) {
                  document.all[id].style.display="none";
                } else if (document.layers) {
                  document.layers[id].display="none";
                } }