if (document.images){
  return_arrow= new Image(53,52);
  return_arrow.src="/imgs/btn_back.jpg";
  return_arrow_hi= new Image(53,52);
  return_arrow_hi.src="/imgs/btn_back_hi.jpg";

  top_arrow= new Image(53,52);
  top_arrow.src="/imgs/btn_top.jpg";
  top_arrow_hi= new Image(53,52);
  top_arrow_hi.src="/imgs/btn_top_hi.jpg";

  btn_search= new Image(53,52);
  btn_search.src="/imgs/btn_search.jpg";
  btn_search_hi= new Image(53,52);
  btn_search_hi.src="/imgs/btn_search_hi.jpg";

  btn_add= new Image(53,52);
  btn_add.src="/imgs/btn_add.jpg";
  btn_add_hi= new Image(53,52);
  btn_add_hi.src="/imgs/btn_add_hi.jpg";
}