if(navigator.appVersion.charAt(0) >= 3) {
 var img = new Array();
 img[0] = new Image();  img[0].src = "images/btn_company.gif";
 img[1] = new Image();  img[1].src = "images/btn_company_over.gif";
 img[2] = new Image();  img[2].src = "images/btn_shohin.gif";
 img[3] = new Image();  img[3].src = "images/btn_shohin_over.gif";
 img[4] = new Image();  img[4].src = "images/btn_campaign.gif";
 img[5] = new Image();  img[5].src = "images/btn_campaign_over.gif";
 img[6] = new Image();  img[6].src = "images/btn_otoiawase.gif";
 img[7] = new Image();  img[7].src = "images/btn_otoiawase_over.gif";
 img[8] = new Image();  img[8].src = "images/btn_link.gif";
 img[9] = new Image();  img[9].src = "images/btn_link_over.gif";
 img[10] = new Image();  img[10].src = "images/btn_recruit.gif";
 img[11] = new Image();  img[11].src = "images/btn_recruit_over.gif";
}

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