function balais(){
 if (document.getElementById){
  document.getElementById('clave').style.visibility='hidden';
  document.getElementById('clavius').style.visibility='hidden';
  document.getElementById('guide').style.visibility='hidden';
  document.getElementById('infos').style.visibility='hidden';
 }

 if (document.all && !document.getElementById){
  document.all['clave'].style.visibility='hidden';
  document.all['clavius'].style.visibility='hidden';
  document.all['guide'].style.visibility='hidden';
  document.all['infos'].style.visibility='hidden';
 }

 if (document.layers){
  document.layers['clave'].visibility='hidden';
  document.layers['clavius'].visibility='hidden';
  document.layers['guide'].visibility='hidden';
  document.layers['infos'].visibility='hidden';
 }
}

t=0;

function affich(calque){

 if (document.all) {
  balais();
  document.all[calque].style.pixelTop=document.body.scrollTop+23;
  document.all[calque].style.visibility='visible';
  clearTimeout(t); 
  t = setTimeout("document.all['"+calque+"'].style.visibility='hidden'",2000);

 }

 else if (document.getElementById&&!document.all) {
  balais();
  document.getElementById(calque).style.top=window.pageYOffset+23;
  document.getElementById(calque).style.visibility='visible';
  clearTimeout(t); 
  t =  setTimeout("document.getElementById('"+calque+"').style.visibility='hidden'",2000);
 }

 else if (document.layers) {
  balais();
  document.layers[calque].top=eval(window.pageYOffset+23);
  document.layers[calque].visibility='visible';
  clearTimeout(t); 
 t =  setTimeout("document.layers['"+calque+"'].visibility='hidden'",2000);

 }
}