function afficheModalites(e)
    {
      if(typeof event == 'undefined')
      {
        x = e.pageX;
        y = e.pageY;
      }
      else
      {
        x = event.x + document.childNodes[1].scrollLeft;
        y = event.y + document.childNodes[1].scrollTop;
      }
      var modalites = document.getElementById('modalites');
      modalites.style.display = 'block';
      modalites.style.top = y - modalites.offsetHeight/2 - 20 + 'px';
      modalites.style.left = x - modalites.offsetWidth - 20 + 'px';
    }
    function cacheModalites()
    {
      document.getElementById('modalites').style.display = '';
    }