function show_hide(bloc1,bloc2)
      {
            elt=document.getElementById(bloc1);
            elt2=document.getElementById(bloc2);

            if (elt.style.display == 'none') {
                  elt.style.display='block';
                  elt2.style.display='none';
            }
            else {

                  elt.style.display='none';
                  elt2.style.display='block';
            }
      }


    function show_hide(bloc1,bloc2,page)
      {
            
            var expDate = new Date()
            expDate.setTime(expDate.getTime() + (365 * 24 * 3600 * 1000))
            elt=document.getElementById(bloc1);
            elt2=document.getElementById(bloc2);

            if (elt.style.display == 'none') {
                  elt.style.display='block';
                  elt2.style.display='none';
                  document.cookie=page+"="+bloc1+";expires=" + expDate.toGMTString()

            }
            else {

                  elt.style.display='none';
                  elt2.style.display='block';
                  document.cookie=page+"="+bloc2+";expires=" + expDate.toGMTString()
            }
      }
      
      function show_bloc(bloc)
      {
            elt=document.getElementById(bloc);
            elt.style.display='block';
      }
      
      function hide_bloc(bloc)
      {
            elt=document.getElementById(bloc);
            elt.style.display='none';
      }