function ouvreId(baliseId){
  document.getElementById(baliseId).style.height='auto';
}

function fermeId(baliseId){
  document.getElementById(baliseId).style.height='35px';
}

function showImgId(baliseId){
  document.getElementById(baliseId).style.margin='0px auto 0px auto';
}

function hideImgId(baliseId){
  document.getElementById(baliseId).style.margin='-125px auto 0px auto';
}