if(navigator.appVersion.charAt(0) >= 3) {
var img = new Array();
img[0] = new Image();  img[0].src = "./top_image/btn_top.gif";
img[1] = new Image();  img[1].src = "./top_image/btn_top_mo.gif";
img[2] = new Image();  img[2].src = "./top_image/btn_shoriki.gif";
img[3] = new Image();  img[3].src = "./top_image/btn_shoriki_mo.gif";
img[4] = new Image();  img[4].src = "./top_image/btn_hikaku.gif";
img[5] = new Image();  img[5].src = "./top_image/btn_hikaku_mo.gif";
img[6] = new Image();  img[6].src = "./top_image/btn_ecoraise.gif";
img[7] = new Image();  img[7].src = "./top_image/btn_ecoraise_mo.gif";
img[8] = new Image();  img[8].src = "./top_image/btn_system.gif";
img[9] = new Image();  img[9].src = "./top_image/btn_system_mo.gif";
img[10] = new Image();  img[10].src = "./top_image/btn_nioi.gif";
img[11] = new Image();  img[11].src = "./top_image/btn_nioi_mo.gif";
img[12] = new Image();  img[12].src = "./top_image/btn_safety.gif";
img[13] = new Image();  img[13].src = "./top_image/btn_safety_mo.gif";
img[14] = new Image();  img[14].src = "./top_image/btn_cost.gif";
img[15] = new Image();  img[15].src = "./top_image/btn_cost_mo.gif";
img[16] = new Image();  img[16].src = "./top_image/btn_use.gif";
img[17] = new Image();  img[17].src = "./top_image/btn_use_mo.gif";
img[18] = new Image();  img[18].src = "./common_images/btn_clean.gif";
img[19] = new Image();  img[19].src = "./common_images/btn_clean_mo.gif";
img[20] = new Image();  img[20].src = "./common_images/btn_spec.gif";
img[21] = new Image();  img[21].src = "./common_images/btn_spec_mo.gif";
img[22] = new Image();  img[22].src = "./common_images/btn_report.gif";
img[23] = new Image();  img[23].src = "./common_images/btn_report_mo.gif";
img[24] = new Image();  img[24].src = "./common_images/btn_faq.gif";
img[25] = new Image();  img[25].src = "./common_images/btn_faq_mo.gif";
img[26] = new Image();  img[26].src = "./common_images/btn_info.gif";
img[27] = new Image();  img[27].src = "./common_images/btn_info_mo.gif";
img[28] = new Image();  img[28].src = "./common_images/btn_contact.gif";
img[29] = new Image();  img[29].src = "./common_images/btn_contact_mo.gif";
img[30] = new Image();  img[30].src = "./common_images/btn_price.gif";
img[31] = new Image();  img[31].src = "./common_images/btn_price_mo.gif";
img[32] = new Image();  img[32].src = "./common_images/btn_mitumori.gif";
img[33] = new Image();  img[33].src = "./common_images/btn_mitumori_mo.gif";
img[34] = new Image();  img[34].src = "./top_image/img_hikakufoot.gif";
img[35] = new Image();  img[35].src = "./top_image/img_hikakufoot_mo.gif";
img[36] = new Image();  img[36].src = "./top_image/btn_about_kankyou.gif";
img[37] = new Image();  img[37].src = "./top_image/btn_about_kankyou_mo.gif";
img[38] = new Image();  img[38].src = "./top_image/btn_about_platina.gif";
img[39] = new Image();  img[39].src = "./top_image/btn_about_platina_mo.gif";
img[40] = new Image();  img[40].src = "./top_image/btn_about_safety.gif";
img[41] = new Image();  img[41].src = "./top_image/btn_about_safety_mo.gif";
img[42] = new Image();  img[42].src = "./top_image/btn_about_cost.gif";
img[43] = new Image();  img[43].src = "./top_image/btn_about_cost_mo.gif";

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