function montre(id) {
  	if (document.getElementById) {
	 document.getElementById(id).style.visibility="visible";
	} else if (document.all) {
	  document.all[id].style.visibility="visible";
	} else if (document.layers) {
	  document.layers[id].visibility="visible";
	} 
} 

function cache(id) {
	if (document.getElementById) {
	  document.getElementById(id).style.visibility="hidden";
	  
	} else if (document.all) {
	  document.all[id].style.visibility="hidden";
	  
	} else if (document.layers) {
	  document.layers[id].visibility="hidden";
	} 
}