if (document.images) { 

// 画像1 
var img1on = new Image();
img1on.src = "images/menu_top_menu11.jpg"; // ポイント時の画像
var img1off = new Image();
img1off.src = "images/menu_top_menu1.jpg"; // 通常の画像

// 画像2 
var img2on = new Image();
img2on.src = "images/menu_top_menu22.jpg";
var img2off = new Image();
img2off.src = "images/menu_top_menu2.jpg";

// 画像3 
var img3on = new Image();
img3on.src = "images/menu_top_menu33.jpg";
var img3off = new Image();
img3off.src = "images/menu_top_menu3.jpg";

// 画像4 
var img4on = new Image();
img4on.src = "images/menu_top_menu44.jpg";
var img4off = new Image();
img4off.src = "images/menu_top_menu4.jpg";

// 画像5 
var img5on = new Image();
img5on.src = "images/menu_j_menu11.jpg";
var img5off = new Image();
img5off.src = "images/button_j_menu1.jpg";

// 画像6 
var img6on = new Image();
img6on.src = "images/menu_j_menu22.jpg";
var img6off = new Image();
img6off.src = "images/button_j_menu2.jpg";

// 画像7 
var img7on = new Image();
img7on.src = "images/menu_j_menu33.jpg";
var img7off = new Image();
img7off.src = "images/button_j_menu3.jpg";

// 画像8 
var img8on = new Image();
img8on.src = "images/menu_j_menu44.jpg";
var img8off = new Image();
img8off.src = "images/button_j_menu4.jpg";

// 画像9 
var img9on = new Image();
img9on.src = "images/menu_j_menu55.jpg";
var img9off = new Image();
img9off.src = "images/button_j_menu5.jpg";

// 画像10 
var img10on = new Image();
img10on.src = "images/menu_j_menu66.jpg";
var img10off = new Image();
img10off.src = "images/button_j_menu6.jpg";

// 画像11 
var img11on = new Image();
img11on.src = "images/button_e_menu11.jpg";
var img11off = new Image();
img11off.src = "images/button_e_menu1.jpg";

// 画像12 
var img12on = new Image();
img12on.src = "images/button_e_menu22.jpg";
var img12off = new Image();
img12off.src = "images/button_e_menu2.jpg";

// 画像13 
var img13on = new Image();
img13on.src = "images/button_e_menu33.jpg";
var img13off = new Image();
img13off.src = "images/button_e_menu3.jpg";

// 画像14 
var img14on = new Image();
img14on.src = "images/button_e_menu44.jpg";
var img14off = new Image();
img14off.src = "images/button_e_menu4.jpg";

// 画像15 
var img15on = new Image();
img15on.src = "images/button_e_menu55.jpg";
var img15off = new Image();
img15off.src = "images/button_e_menu5.jpg";

// 画像16 
var img16on = new Image();
img16on.src = "images/button_f_menu11.jpg";
var img16off = new Image();
img16off.src = "images/button_f_menu1.jpg";

// 画像17 
var img17on = new Image();
img17on.src = "images/button_f_menu22.jpg";
var img17off = new Image();
img17off.src = "images/button_f_menu2.jpg";

// 画像18 
var img18on = new Image();
img18on.src = "images/button_f_menu33.jpg";
var img18off = new Image();
img18off.src = "images/button_f_menu3.jpg";

// 画像19 
var img19on = new Image();
img19on.src = "images/button_f_menu44.jpg";
var img19off = new Image();
img19off.src = "images/button_f_menu4.jpg";

// 画像20 
var img20on = new Image();
img20on.src = "images/button_f_menu55.jpg";
var img20off = new Image();
img20off.src = "images/button_f_menu5.jpg";

// 画像21 
var img21on = new Image();
img21on.src = "images/button_g_menu11.jpg";
var img21off = new Image();
img21off.src = "images/button_g_menu1.jpg";

// 画像22 
var img22on = new Image();
img22on.src = "images/button_g_menu22.jpg";
var img22off = new Image();
img22off.src = "images/button_g_menu2.jpg";

// 画像23 
var img23on = new Image();
img23on.src = "images/button_g_menu33.jpg";
var img23off = new Image();
img23off.src = "images/button_g_menu3.jpg";

// 画像24 
var img24on = new Image();
img24on.src = "images/button_g_menu44.jpg";
var img24off = new Image();
img24off.src = "images/button_g_menu4.jpg";

// 画像25 
var img25on = new Image();
img25on.src = "images/button_g_menu55.jpg";
var img25off = new Image();
img25off.src = "images/button_g_menu5.jpg";

} 

// ポイント時の処理 
function On(name) { 

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

} 

// 放した時の処理 
function Off(name) { 

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

}