if(navigator.appVersion.charAt(0) >= 3) {
 var img = new Array();
 img[0] = new Image();  img[0].src = "images/b_system.gif";
 img[1] = new Image();  img[1].src = "images/b_system_over.gif";
 img[2] = new Image();  img[2].src = "images/b_tetsuzuki.gif";
 img[3] = new Image();  img[3].src = "images/b_tetsuzuki_over.gif";
 img[4] = new Image();  img[4].src = "images/b_pack.gif";
 img[5] = new Image();  img[5].src = "images/b_pack_over.gif";
 img[6] = new Image();  img[6].src = "images/b_campaign.gif";
 img[7] = new Image();  img[7].src = "images/b_campaign_over.gif";
 img[8] = new Image();  img[8].src = "images/b_form.gif";
 img[9] = new Image();  img[9].src = "images/b_form_over.gif";
 img[10] = new Image();  img[10].src = "images/b_link.gif";
 img[11] = new Image();  img[11].src = "images/b_link_over.gif";
 img[12] = new Image();  img[12].src = "images/b_gaiyou.gif";
 img[13] = new Image();  img[13].src = "images/b_gaiyou_over.gif";
 img[14] = new Image();  img[14].src = "images/maru_ya.gif";
 img[15] = new Image();  img[15].src = "images/mary_ya_over.gif";
 img[16] = new Image();  img[16].src = "images/i.jpg";
 img[17] = new Image();  img[17].src = "images/ib.jpg";
 img[18] = new Image();  img[18].src = "images/ez.jpg";
 img[19] = new Image();  img[19].src = "images/ezb.jpg";
 img[20] = new Image();  img[20].src = "images/jsky.jpg";
 img[21] = new Image();  img[21].src = "images/jskyb.jpg";



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