//画像のプリロード
function PreLoad(obj,val) {
    var d = document;
    var img = obj;
    d.img = new Image();
    d.img.src = val;
}

//QRコード切り替え

function show1(){
	qr1.style.display="block";
	qr2.style.display="none";
	qr3.style.display="none";
}

function show2(){
	qr1.style.display="none";
	qr2.style.display="block";
	qr3.style.display="none";
}

function show3(){
	qr1.style.display="none";
	qr2.style.display="none";
	qr3.style.display="block";
}