if (document.images) { 

var img1on = new Image();
img1on.src = "../images/btn_okinawa_header_home_on.gif"; 
var img1off = new Image();
img1off.src = "../images/btn_okinawa_header_home.gif";

var img2on = new Image();
img2on.src = "../images/btn_okinawa_header_about_on.gif";
var img2off = new Image();
img2off.src = "../images/btn_okinawa_header_about.gif";

var img3on = new Image();
img3on.src = "../images/btn_okinawa_header_eco_on.gif";
var img3off = new Image();
img3off.src = "../images/btn_okinawa_header_eco.gif";

var img4on = new Image();
img4on.src = "../images/btn_okinawa_header_okinawa_on.gif";
var img4off = new Image();
img4off.src = "../images/btn_okinawa_header_okinawa.gif";

var img5on = new Image();
img5on.src = "../images/btn_okinawa_header_brand_on.gif"; 
var img5off = new Image();
img5off.src = "../images/btn_okinawa_header_brand.gif";

var img6on = new Image();
img6on.src = "../images/btn_okinawa_header_shop_on.gif";
var img6off = new Image();
img6off.src = "../images/btn_okinawa_header_shop.gif";

var img7on = new Image();
img7on.src = "../images/btn_okinawa_header_inquiry_on.gif";
var img7off = new Image();
img7off.src = "../images/btn_okinawa_header_inquiry.gif";

var img8on = new Image();
img8on.src = "../images/btn_okinawa_header_sitemap_on.gif";
var img8off = new Image();
img8off.src = "../images/btn_okinawa_header_sitemap.gif";


var img9on = new Image();
img9on.src = "../images/menu_photo_getto_on.jpg";
var img9off = new Image();
img9off.src = "../images/menu_photo_getto.jpg";

var img10on = new Image();
img10on.src = "../images/menu_photo_papaya_on.jpg";
var img10off = new Image();
img10off.src = "../images/menu_photo_papaya.jpg";

var img11on = new Image();
img11on.src = "../images/menu_photo_uikyo_on.jpg";
var img11off = new Image();
img11off.src = "../images/menu_photo_uikyo.jpg";

var img12on = new Image();
img12on.src = "../images/menu_photo_kumis_on.jpg";
var img12off = new Image();
img12off.src = "../images/menu_photo_kumis.jpg";

var img13on = new Image();
img13on.src = "../images/menu_photo_deigo_on.jpg";
var img13off = new Image();
img13off.src = "../images/menu_photo_deigo.jpg";

var img14on = new Image();
img14on.src = "../images/menu_photo_umibudo_on.jpg";
var img14off = new Image();
img14off.src = "../images/menu_photo_umibudo.jpg";

var img15on = new Image();
img15on.src = "../images/btn_menu_getto_on.gif";
var img15off = new Image();
img15off.src = "../images/btn_menu_getto.gif";

var img16on = new Image();
img16on.src = "../images/btn_menu_papaya_on.gif";
var img16off = new Image();
img16off.src = "../images/btn_menu_papaya.gif";

var img17on = new Image();
img17on.src = "../images/btn_menu_uikyo_on.gif";
var img17off = new Image();
img17off.src = "../images/btn_menu_uikyo.gif";

var img18on = new Image();
img18on.src = "../images/btn_menu_kumis_on.gif";
var img18off = new Image();
img18off.src = "../images/btn_menu_kumis.gif";

var img19on = new Image();
img19on.src = "../images/btn_menu_deigo_on.gif";
var img19off = new Image();
img19off.src = "../images/btn_menu_deigo.gif";

var img20on = new Image();
img20on.src = "../images/btn_menu_umibudo_on.gif";
var img20off = new Image();
img20off.src = "../images/btn_menu_umibudo.gif";

} 


function On(name) { 

if (document.images) { 
document.images[name].src = eval(name + 'on.src'); 
} 

} 


function Off(name) { 

if (document.images) { 
document.images[name].src = eval(name + 'off.src'); 
} 

}