function afficheId(baliseId) 
  {
  id_array=new Array('service','service1','service2','service3','service4');
	for(i=0;i<id_array.length;i++){
		 document.getElementById(id_array[i]).style.visibility='hidden';
   		 document.getElementById(id_array[i]).style.display='none';
	}
  if (document.getElementById && document.getElementById(baliseId) != null) 
    {
    document.getElementById(baliseId).style.visibility='visible';
    document.getElementById(baliseId).style.display='block';
    }
  }

function cacheId(baliseId) 
  {
  if (document.getElementById && document.getElementById(baliseId) != null) 
    {
    document.getElementById(baliseId).style.visibility='hidden';
    document.getElementById(baliseId).style.display='none';
    }
  }