var item = 0;
function change_url() {
  if (document.img.complete) {
    if (item==0) {
      document.img.src = "./img/image00.jpg";
    }
    if (item==1) {
      document.img.src = "./img/image01.jpg";
    }
	}
  item += 1;
  if (item>3) item = 0;
  setTimeout("change_url()",5000);
}
function open_win() {
  if (item==1) {
    window.open("http://アニマルセラピー.jp","_self");
  }
  if (item==2) {
    window.open("mailto:info@kaigo-net.org","_self");
  }
}