function montrer(i) {
  cacher();
  if (document.all){
	document.all["rubon"+i].style.visibility="visible";
	document.all["fond"].style.visibility="visible"
  }
  if (i<1){
	document.all["lien"+i].style.visibility="visible"
  }
}
function cacher() {
  for (var i=0;i<6;i++){
    if (document.all){
	document.all["rubon"+i].style.visibility="hidden";
    }
  }
  for (var i=0;i<1;i++){
    if (document.all){
	document.all["lien"+i].style.visibility="hidden"
    }
  }
  if (document.all){document.all["fond"].style.visibility="hidden"}
}