if(document.images) {
var imgs = new Array();
imgs[0] = new Image(); imgs[0].src = "image/tn_webmenu_01.gif"; 
imgs[1] = new Image(); imgs[1].src = "image/tn_webmenu_01on.gif"; 
imgs[2] = new Image(); imgs[2].src = "image/tn_webmenu_02.gif"; 
imgs[3] = new Image(); imgs[3].src = "image/tn_webmenu_02on.gif"; 
imgs[4] = new Image(); imgs[4].src = "image/tn_webmenu_03.gif"; 
imgs[5] = new Image(); imgs[5].src = "image/tn_webmenu_03on.gif"; 
imgs[6] = new Image(); imgs[6].src = "image/tn_webmenu_04.gif"; 
imgs[7] = new Image(); imgs[7].src = "image/tn_webmenu_04on.gif"; 
imgs[8] = new Image(); imgs[8].src = "image/tn_webmenu_05.gif"; 
imgs[9] = new Image(); imgs[9].src = "image/tn_webmenu_05on.gif"; 
imgs[10] = new Image(); imgs[10].src = "image/tn_webmenu_06.gif"; 
imgs[11] = new Image(); imgs[11].src = "image/tn_webmenu_06on.gif"; 
imgs[12] = new Image(); imgs[12].src = "image/tn_webmenu_07.gif"; 
imgs[13] = new Image(); imgs[13].src = "image/tn_webmenu_07on.gif"; 
imgs[14] = new Image(); imgs[14].src = "image/tn_webmenu_08.gif"; 
imgs[15] = new Image(); imgs[15].src = "image/tn_webmenu_08on.gif"; 

}

function chgimg(id, imgname) {
if(document.images) {
if(imgs[imgname]) {
document.images[id].src = imgs[imgname].src;
}
else {
document.images[id].src = imgname;
}
}
}