if(navigator.appVersion.charAt(0) >= "3"){
  img = new Array();
  img[0] = new Image; img[0].src = "./images/navi/sinchiku1.gif";
  img[1] = new Image; img[1].src = "./images/navi/sinchiku2.gif";
  img[2] = new Image; img[2].src = "./images/navi/chukai1.gif";
  img[3] = new Image; img[3].src = "./images/navi/chukai2.gif";
  img[4] = new Image; img[4].src = "./images/navi/past1.gif";
  img[5] = new Image; img[5].src = "./images/navi/past2.gif";
  img[6] = new Image; img[6].src = "./images/navi/blog1.gif";
  img[7] = new Image; img[7].src = "./images/navi/blog2.gif"; 
  img[8] = new Image; img[8].src = "./images/navi/kariru1.gif";
  img[9] = new Image; img[9].src = "./images/navi/kariru2.gif";
  img[10] = new Image; img[10].src = "./images/navi/uru1.gif";
  img[11] = new Image; img[11].src = "./images/navi/uru2.gif";
  img[12] = new Image; img[12].src = "./images/navi/kau1.gif";
  img[13] = new Image; img[13].src = "./images/navi/kau2.gif";
  img[14] = new Image; img[14].src = "./images/navi/top1.gif";
  img[15] = new Image; img[15].src = "./images/navi/top2.gif";
  img[16] = new Image; img[16].src = "./images/navi/company1.gif";
  img[17] = new Image; img[17].src = "./images/navi/company2.gif";
  img[18] = new Image; img[18].src = "./images/navi/info1.gif";
  img[19] = new Image; img[19].src = "./images/navi/info2.gif";
}
 function chg_img(imgname,a){  
   if(navigator.appVersion.charAt(0) >= "3"){
     document.images[imgname].src=img[a].src;
  }
}