function gestionMenu(numSection)
{
  /* "Magic number" : permet de savoir le nombre de section dans le menu */
  var nbSection = 11;
  var stringPart = "menu";
  var currentMenu;
  var hideOrShow = new Array();

  hideOrShow["none"] = "block";
  hideOrShow["block"] = "none";


  for(var i = 1; i < nbSection; i++)
  {
    if((currentMenu = document.getElementById(stringPart + i)))
    {
      if(i == numSection)
        currentMenu.style.display = hideOrShow[currentMenu.style.display];
      else
        currentMenu.style.display = "none";
    }
  }
}

/* Permet de gérer les sous-menu. */
function gestionSubMenu(idSection, idSubSection)
{
  var nbSubSection = 10;
  var stringPart = "ss_menu";
  var currentSubMenu;

  for(var i = 1; i < nbSubSection; i++)
  {
    if((currentSubMenu = document.getElementById(stringPart + idSection + i)))
    {
      if(i == idSubSection)
        currentSubMenu.style.display = "block";
      else
        currentSubMenu.style.display = "none";
    }
  }
}

/* Permet de cahcer tous les menus dans le cas où l'on utilise les sous-sections
 * du menu.
 */
function hideAll()
{
  /* "Magic number" : permet de savoir le nombre de section dans le menu */
  var nbSection = 9;
  var currentMenu;

  for(var i = 1; i < nbSection; i++)
    if((currentMenu = document.getElementById("menu" + i)))
      currentMenu.style.display = "none";
}