if(navigator.appVersion.charAt(0) >= 3) {
var img = new Array();
img[0] = new Image();  img[0].src = "http://www.jyosyu.co.jp/contents/home_a.gif";
img[1] = new Image();  img[1].src = "http://www.jyosyu.co.jp/contents/home_b.gif";
img[2] = new Image();  img[2].src = "http://www.jyosyu.co.jp/contents/hp_a.gif";
img[3] = new Image();  img[3].src = "http://www.jyosyu.co.jp/contents/hp_b.gif";
img[4] = new Image();  img[4].src = "http://www.jyosyu.co.jp/contents/hp_product_a.gif";
img[5] = new Image();  img[5].src = "http://www.jyosyu.co.jp/contents/hp_product_b.gif";
img[6] = new Image();  img[6].src = "http://www.jyosyu.co.jp/contents/camera_a.gif";
img[7] = new Image();  img[7].src = "http://www.jyosyu.co.jp/contents/camera_b.gif";
img[8] = new Image();  img[8].src = "http://www.jyosyu.co.jp/contents/menu_product_a.gif";
img[9] = new Image();  img[9].src = "http://www.jyosyu.co.jp/contents/menu_product_b.gif";
img[10] = new Image();  img[10].src = "http://www.jyosyu.co.jp/contents/photo_a.gif";
img[11] = new Image();  img[11].src = "http://www.jyosyu.co.jp/contents/photo_b.gif";
img[12] = new Image();  img[12].src = "http://www.jyosyu.co.jp/contents/poster_a.gif";
img[13] = new Image();  img[13].src = "http://www.jyosyu.co.jp/contents/poster_b.gif";
}
function change_image(nam,num){
if(navigator.appVersion.charAt(0) >= 3){
document.images[nam].src = img[num].src;}
}