if(navigator.appVersion.charAt(0) >= "3") {
   var img = new Array();
     img[0] = new Image();  img[0].src = "./bg/off_back.gif";
     img[1] = new Image();  img[1].src = "./bg/on_back.gif";
     img[2] = new Image();  img[2].src = "./bg/off_doc.gif";
     img[3] = new Image();  img[3].src = "./bg/on_doc.gif";
     img[4] = new Image();  img[4].src = "./bg/off_event.gif";
     img[5] = new Image();  img[5].src = "./bg/on_event.gif";
     img[6] = new Image();  img[6].src = "./bg/off_exhibit.gif";
     img[7] = new Image();  img[7].src = "./bg/on_exhibit.gif";
     img[8] = new Image();  img[8].src = "./bg/off_hs.gif";
     img[9] = new Image();  img[9].src = "./bg/on_hs.gif";
     img[10] = new Image();  img[10].src = "./bg/off_resi.gif";
     img[11] = new Image();  img[11].src = "./bg/on_resi.gif";
     img[12] = new Image();  img[12].src = "./bg/off_sympo.gif";
     img[13] = new Image();  img[13].src = "./bg/on_sympo.gif";
     img[14] = new Image();  img[14].src = "./bg/off_ws.gif";
     img[15] = new Image();  img[15].src = "./bg/on_ws.gif";
    }

  function _inout(nam,num) {
    if(navigator.appVersion.charAt(0) >= "3") {
      document.images[nam].src = img[num].src;
     }
   }

  function _back1() {
    if(navigator.appVersion.charAt(0) >= "3") {
      parent.mimo.history.back();
     }
   }
  function _back2() {
    if(navigator.appVersion.charAt(0) < "3") {
      url = parent.haizuka.document.referrer;
      if (url == '') {
        url = 'http://www.ny.airnet.ne.jp/haizuka/2000/';
       }
      parent.haizuka.location = url;
     }
   }