if(navigator.appVersion.charAt(0) >= 3) {
 var img = new Array();
  img[0] = new Image();
  img[0].src = "img/m_riyou1.gif";
  img[1] = new Image();
  img[1].src = "img/m_riyou.gif";
  img[2] = new Image();
  img[2].src = "img/m_shiyouryou1.gif";
  img[3] = new Image();
  img[3].src = "img/m_shiyouryou.gif";
  img[4] = new Image();
  img[4].src = "img/m_sports1.gif";
  img[5] = new Image();
  img[5].src = "img/m_sports.gif";
  img[6] = new Image();
  img[6].src = "img/m_swimming1.gif";
  img[7] = new Image();
  img[7].src = "img/m_swimming.gif";
  img[8] = new Image();
  img[8].src = "img/m_bunka1.gif";
  img[9] = new Image();
  img[9].src = "img/m_bunka.gif";
  img[10] = new Image();
  img[10].src = "img/m_s1f1.gif";
  img[11] = new Image();
  img[11].src = "img/m_s1f.gif";
  img[12] = new Image();
  img[12].src = "img/m_s2f1.gif";
  img[13] = new Image();
  img[13].src = "img/m_s2f.gif";
  img[14] = new Image();
  img[14].src = "img/m_s3f1.gif";
  img[15] = new Image();
  img[15].src = "img/m_s3f.gif";
  img[16] = new Image();
  img[16].src = "img/m_sroof1.gif";
  img[17] = new Image();
  img[17].src = "img/m_sroof.gif";
  img[18] = new Image();
  img[18].src = "img/m_sout1.gif";
  img[19] = new Image();
  img[19].src = "img/m_sout.gif";
 }
 function change_image(no1,no2) {
  if(navigator.appVersion.charAt(0) >= 3) {
   document.images[no1].src = img[no2].src;
   }
 }