if (document.images) { 

var img1on = new Image();
img1on.src = "images/top_japanese02.gif"; 
var img1off = new Image();
img1off.src = "images/top_japanese.gif";

var img2on = new Image();
img2on.src = "images/top_museum02.gif";
var img2off = new Image();
img2off.src = "images/top_museum01.gif";

var img4on = new Image();
img4on.src = "../images/top_columnindex02.gif";
var img4off = new Image();
img4off.src = "../images/top_columnindex01.gif";

var img5on = new Image();
img5on.src = "../images/top_go02.gif";
var img5off = new Image();
img5off.src = "../images/top_go01.gif";


var img6on = new Image();
img6on.src = "images/btn_museum02.gif";
var img6off = new Image();
img6off.src = "images/btn_museum01.gif";

var img7on = new Image();
img7on.src = "images/btn_mail02.gif";
var img7off = new Image();
img7off.src = "images/btn_mail01.gif";

var img8on = new Image();
img8on.src = "images/btn_map02.gif";
var img8off = new Image();
img8off.src = "images/btn_map01.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'); 
} 

}