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";
		  
		} }