var current_pos = 0;

function startSwitchApercu()
{
  setTimeout('switchApercu()', 5000);
}

function switchApercu()
{
  h_agenda = document.getElementById('head_apercu_agenda');
  agenda = document.getElementById('apercu_agenda');
  h_projets = document.getElementById('head_apercu_projets');
  projets = document.getElementById('apercu_projets');

  if (current_pos == 0) {
    h_agenda.className = 'grayed';
    agenda.style.display = 'none';
    h_projets.className = '';
    projets.style.display = 'block';
  }
  else {
    h_agenda.className = '';
    agenda.style.display = 'block';
    h_projets.className = 'grayed';
    projets.style.display = 'none';
  }
  current_pos = 1 - current_pos;

  startSwitchApercu();
}