function showHideItemDescr(id)
{
 if ( id == "descriptif" )
 {
  document.getElementById("descriptif").style.display="block";
  document.getElementById("medaille").style.display="none";
  document.getElementById("odescriptif").className = "actif";
  document.getElementById("omedaille").className = "";
 }
 else if ( id == "medaille" )
 {
  document.getElementById("descriptif").style.display="none";
  document.getElementById("medaille").style.display="block";
  document.getElementById("odescriptif").className = "";
  document.getElementById("omedaille").className = "actif";
 }
}