//レイヤーの表示・非表示
function sh(layName){
	if(document.getElementById)document.getElementById(layName).style.visibility = "visible"; //NN6/IE5
}
function hd(layName){
	if(document.getElementById)document.getElementById(layName).style.visibility = "hidden"; //NN6/IE5
}

//タイマー設定
var StartTime;
var myId;
function TimerStart(){
myId=setInterval("res()",300);
}
function res_time(){
TimerStart();
}


function res(){
for(var i=1;i<=4;i++){
hd('ly'+i);
}
if(myId)clearInterval(myId);
}

function lay_on(num){
if(myId)clearInterval(myId);
for(var i=1;i<=4;i++){
if(i!=num){
hd('ly'+i);
}
}
sh('ly'+num);
}