function afficheId(baliseId){
if(document.getElementById(baliseId)){
  document.getElementById(baliseId).style.display='block';
}else{
}
}

function cacheId(baliseId){
if(document.getElementById(baliseId)){
  document.getElementById(baliseId).style.display='none';
}else{
}
}

function agrandir(agrandirId){
  document.getElementById(agrandirId).style.height = 'auto';
}

function reduire(reduireId){
  document.getElementById(reduireId).style.height = '300px';
}

function test(agrandirId){
  document.getElementById(agrandirId).style.marginTop = '-300px';
}

function visibleId(baliseId){

  document.getElementById(baliseId).style.visibility='visible';
}
function masqueId(baliseId){
  document.getElementById(baliseId).style.visibility='hidden';
}