stored=null;
  storedLocation=null;

  a=load("images/menu_1_1.gif");
  b=load("images/menu_2_1.gif");
  c=load("images/menu_3_1.gif");
  d=load("images/menu_4_1.gif");

function load(location){
    image=new Image();
    image.src=location;
    return image;
  }
  function show(where,what){
    stored=where;
    storedLocation=document.images[where].src;
    document.images[where].src=eval(what+".src");
  }
  function hide(){
    document.images[stored].src=storedLocation;
  }

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}