var Dessus=0; //photo visible
var exDessus="0"; //ancienne photo visible
var NbMax=0; //nbre d'images
var ie=0, repNS=0;
document.onkeydown = Touche;	
if (document.all) ie=1;
else document.captureEvents(Event.KEYDOWN);

function Montre(num) {
  Dessus = parseInt(num);
var  ObjetImageNouv = document.getElementById("Im"+num);
var  ObjetImageAnc = document.getElementById("Im"+exDessus);
  ObjetImageAnc.style.zIndex=25-parseInt(exDessus);
  ObjetImageAnc.style.borderWidth="0";
  ObjetImageNouv.style.zIndex=100;
  ObjetImageNouv.style.border="0.1cm solid orange";
  exDessus=num;
  Legende(Dessus); }
  
function Commente(num) {
  if (num==1) {
    document.getElementById("CommentCourt").style.visibility="hidden";
    document.getElementById("CommentLong").style.visibility="visible"; }
  else {
    document.getElementById("CommentCourt").style.visibility="visible";
    document.getElementById("CommentLong").style.visibility="hidden"; } }

function Touche(e){
  if (ie==0) {
    keyCode=e.which;
    if (repNS==0) repNS++;
    else {repNS--; return false; } }
  else keyCode=event.keyCode;
  if (keyCode==39) {
    var numTouche=Dessus+1;
    if (numTouche > NbMax) numTouche=0;
    Montre(numTouche); }
  if (keyCode==37) {
    var numTouche=Dessus-1;
    if (numTouche < 0 ) numTouche=NbMax;
    Montre(numTouche); } }