//レイヤーの表示・非表示
function sh(layName){
  if(document.layers)document.layers[layName].display='block'  //  IE4/IE5
  if(document.all)document.all(layName).style.display='block' // NN4.x
  if(document.getElementById)document.getElementById(layName).style.display = "block"; //NN6/IE5

}
function hd(layName){
  if(document.layers)document.layers[layName].display='none'  //  IE4/IE5
  if(document.all)document.all(layName).style.display='none' // NN4.x
  if(document.getElementById)document.getElementById(layName).style.display = "none"; //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<=6;i++){
hd('ly'+i);
}
if(myId)clearInterval(myId);
}

function lay_on(num){
if(myId)clearInterval(myId);
for(var i=1;i<=6;i++){
if(i!=num){
hd('ly'+i);
}
}
sh('ly'+num);
}