if (document.images) { 

var img1on = new Image();
img1on.src = "images/btn_home_on.gif"; 
var img1off = new Image();
img1off.src = "images/btn_home.gif";

var img2on = new Image();
img2on.src = "images/btn_guide_on.gif";
var img2off = new Image();
img2off.src = "images/btn_guide.gif";

var img3on = new Image();
img3on.src = "images/btn_pay_on.gif";
var img3off = new Image();
img3off.src = "images/btn_pay.gif";

var img4on = new Image();
img4on.src = "images/btn_sample_on.gif";
var img4off = new Image();
img4off.src = "images/btn_sample.gif";

var img5on = new Image();
img5on.src = "images/btn_type_on.gif"; 
var img5off = new Image();
img5off.src = "images/btn_type.gif";

var img6on = new Image();
img6on.src = "images/btn_itemlist_on.gif";
var img6off = new Image();
img6off.src = "images/btn_itemlist.gif";

var img7on = new Image();
img7on.src = "images/btn_faq_on.gif";
var img7off = new Image();
img7off.src = "images/btn_faq.gif";

var img8on = new Image();
img8on.src = "images/btn_inquiry_on.gif";
var img8off = new Image();
img8off.src = "images/btn_inquiry.gif";

var img9on = new Image();
img9on.src = "images/btn_sitemap_on.gif";
var img9off = new Image();
img9off.src = "images/btn_sitemap.gif";

var img0on = new Image();
img0on.src = "../images/btn_voice_on.gif";
var img0off = new Image();
img0off.src = "../images/btn_voice.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'); 
} 

}