if(document.images){
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() {
if(document.images){
  img1.src = "images/menu1lw.gif";
  img2.src = "images/menu2lw.gif";
  img3.src = "images/menu3lw.gif";
  img4.src = "images/menu4lw.gif";
  img5.src = "images/menu5lw.gif";
  img6.src = "images/menu6lw.gif";

  }
  } 
function highlight(img) {
if(document.images){  
document[img].src = "images/" + img + "w.gif";
}
}
function unhighlight(img) {
if(document.images){
   document[img].src ="images/" +  img + ".gif";
}
}