if (document.images) { 

var img1on = new Image();
img1on.src = "images/photo/menu_wanko2.jpg"; // ポイント時の画像
var img1off = new Image();
img1off.src = "images/photo/menu_wanko.jpg"; // 通常の画像

var img2on = new Image();
img2on.src = "images/photo/menu_hokkaido2.jpg";
var img2off = new Image();
img2off.src = "images/photo/menu_hokkaido.jpg";

var img3on = new Image();
img3on.src = "images/photo/menu_sora2.jpg";
var img3off = new Image();
img3off.src = "images/photo/menu_sora.jpg";

var img4on = new Image();
img4on.src = "images/titlerogo2.gif";
var img4off = new Image();
img4off.src = "images/titlerogo1.gif";


var img5on = new Image();
img5on.src = "images/photo/menu_wanko2.jpg"; 
var img5off = new Image();
img5off.src = "images/photo/menu_wanko.jpg";

var img6on = new Image();
img6on.src = "images/photo/menu_hokkaido2.jpg";
var img6off = new Image();
img6off.src = "images/photo/menu_hokkaido.jpg";

var img7on = new Image();
img7on.src = "images/photo/menu_sora2.jpg";
var img7off = new Image();
img7off.src = "images/photo/menu_sora.jpg";

var img8on = new Image();
img8on.src = "images/profile/profile_sub.jpg";
var img8off = new Image();
img8off.src = "images/profile/profile_top.jpg";

} 

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'); 
} 
}