function Img_Change_yadokariya(no) {
  document.getElementById('yadokariya_pic').style.background = "url(/images/" + no + ".jpg) no-repeat center";
}

function set_img_yadokariya() {
  document.getElementById('yadokariya_pic').style.background = "url(/images/" + 1 + ".jpg) no-repeat center";
}