<!--
var img1 = new Image();
var img2 = new Image();
var img3 = new Image();
var img4 = new Image();
var img5 = new Image();
var img6 = new Image();
function init(){
  img1.src = "./image/menu_1b.gif";
  img2.src = "./image/menu_2b.gif";
  img3.src = "./image/menu_3b.gif";
  img4.src = "./image/menu_4b.gif";
  img5.src = "./image/menu_5b.gif";
  img6.src = "./image/menu_6b.gif";
}
function lighton(img){
   document[img].src = "./image/"+img+"b.gif";
}
function lightoff(img){
   document[img].src = "./image/"+img+"a.gif";
}
//-->