function hideqr() {
    document.getelementbyid("descssb").style.display = "none";
    document.getelementbyid("showleft").style.display = "none";
    document.getelementbyid("qratag").style.display = "none";
    document.getelementbyid("elevator_item2").style.display = "block";
}
function showqr() {
    document.getelementbyid("descssb").style.display = "block";
    document.getelementbyid("showleft").style.display = "block";
    document.getelementbyid("qratag").style.display = "block";
    document.getelementbyid("elevator_item2").style.display = "none";
}