if (document.images) { 

// 雑学ナビゲーション
var img38on = new Image();
img38on.src = "../images/history_navi01on.gif"; 
var img38off = new Image();
img38off.src = "../images/history_navi01.gif";

var img39on = new Image();
img39on.src = "../images/history_navi02on.gif"; 
var img39off = new Image();
img39off.src = "../images/history_navi02.gif";

var img40on = new Image();
img40on.src = "../images/history_navi03on.gif"; 
var img40off = new Image();
img40off.src = "../images/history_navi03.gif";

var img41on = new Image();
img41on.src = "../images/history_navi04on.gif"; 
var img41off = new Image();
img41off.src = "../images/history_navi04.gif";

var img48on = new Image();
img48on.src = "../images/history_navi2-01on.gif"; 
var img48off = new Image();
img48off.src = "../images/history_navi2-01.gif";

var img53on = new Image();
img53on.src = "../images/history_navi2-02on.gif"; 
var img53off = new Image();
img53off.src = "../images/history_navi2-02.gif";

var img54on = new Image();
img54on.src = "../images/history_navi2-03on.gif"; 
var img54off = new Image();
img54off.src = "../images/history_navi2-03.gif";

var img55on = new Image();
img55on.src = "../images/history_navi2-04on.gif"; 
var img55off = new Image();
img55off.src = "../images/history_navi2-04.gif";

var img56on = new Image();
img56on.src = "../images/history_navi2-05on.gif"; 
var img56off = new Image();
img56off.src = "../images/history_navi2-05.gif";

var img57on = new Image();
img57on.src = "../images/history_navi2-06on.gif"; 
var img57off = new Image();
img57off.src = "../images/history_navi2-06.gif";

var img58on = new Image();
img58on.src = "../images/history_navi2-07on.gif"; 
var img58off = new Image();
img58off.src = "../images/history_navi2-07.gif";

var img59on = new Image();
img59on.src = "../images/history_navi2-08on.gif"; 
var img59off = new Image();
img59off.src = "../images/history_navi2-08.gif";

var img60on = new Image();
img60on.src = "../images/history_navi2-09on.gif"; 
var img60off = new Image();
img60off.src = "../images/history_navi2-09.gif";

var img61on = new Image();
img61on.src = "../images/history_navi2-10on.gif"; 
var img61off = new Image();
img61off.src = "../images/history_navi2-10.gif";

var img62on = new Image();
img62on.src = "../images/history_navi2-11on.gif"; 
var img62off = new Image();
img62off.src = "../images/history_navi2-11.gif";

var img63on = new Image();
img63on.src = "../images/history_navi2-12on.gif"; 
var img63off = new Image();
img63off.src = "../images/history_navi2-12.gif";

var img64on = new Image();
img64on.src = "../images/history_navi2-13on.gif"; 
var img64off = new Image();
img64off.src = "../images/history_navi2-13.gif";

var img65on = new Image();
img65on.src = "../images/history_navi2-14on.gif"; 
var img65off = new Image();
img65off.src = "../images/history_navi2-14.gif";

var img66on = new Image();
img66on.src = "../images/history_navi2-15on.gif"; 
var img66off = new Image();
img66off.src = "../images/history_navi2-15.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'); 
} 

}