i1 = new Image;
  i1.src = "image/travail2.jpg";
  i2 = new Image;
  i2.src = "image/informatique2.jpg";
  i3 = new Image;
  i3.src = "image/maison2.jpg";
  i4 = new Image;
  i4.src = "image/personne2.jpg";
  i5 = new Image;
  i5.src = "image/bagagerie2.jpg";
  i6 = new Image;
  i6.src = "image/devdurable2.jpg";
  i7 = new Image;
  i7.src = "image/stylo2.jpg";
  i8 = new Image;
  i8.src = "image/porte-cle2.jpg";
  i9 = new Image;
  i9.src = "image/sport2.jpg";
  i10 = new Image;
  i10.src = "image/securite2.jpg";
  i11 = new Image;
  i11.src = "image/monter2.jpg";

function Display(obj,id) {
  obj.style.background='url(/image/'+id+'2.jpg)';
  document.getElementById('txt_'+id+'').style.display='block';
  obj.style.cursor='pointer';
}

function Hide(obj,id) {
  obj.style.background='url(/image/'+id+'.jpg)';
  document.getElementById('txt_'+id+'').style.display='none';
}