//イメージの事前読み込み
if(navigator.appVersion.charAt(0)>=3)
{
movimg=new Array()
movimg[0] = new Image();movimg[0].src='image/banner_zaihokan_b.gif';
movimg[1] = new Image();movimg[1].src='image/banner_zaihokan_c.gif';
movimg[2] = new Image();movimg[2].src='image/banner_zaihokan_d.gif';
movimg[3] = new Image();movimg[3].src='image/banner_zaihokan_a.gif';
};

//画像書き換え
function changImg1(imgNoA,imgNoB)
{
  if(navigator.appVersion.charAt(0)>=3)
  {
  document.images[imgNoA].src=movimg[imgNoB].src;
  };
};