//レイヤーの表示・非表示
function sh(layName){
  if(document.layers)document.layers[layName].visibility='show';
  if(document.all)document.all(layName).style.visibility='visible';
  if(document.getElementById)document.getElementById(layName).style.visibility = "visible";
}

function hd(layName){
  if(document.layers)document.layers[layName].visibility='hide' ;
  if(document.all)document.all(layName).style.visibility='hidden';
  if(document.getElementById)document.getElementById(layName).style.visibility = "hidden";
}

function res(){
	for(var i=1;i<=8;i++){
	hd('ly'+i);
	hd('dly'+i);
	}
}

function on(num){
	for(var i=1;i<=8;i++){
	if(i!=num){
	hd('ly'+i);
	hd('dly'+i);
	}
	}
sh('ly'+num);
sh('dly'+num);
}