current_overID = "";
  last_overID = "";

  function item (img_name,width,height)
  {
  img_prefix = img_name;
  this.slide_img = new Image (width,height);
  this.slide_img.src = "images/" + img_prefix + ".gif";
  }

  function new_item (img_name,width,height)
  {
  item [img_name] = new item (img_name,width,height);
  }

  function mouseover (itemID)
  {
  current_overID = itemID;
  if (current_overID != last_overID) {
    document.jrcmap.src = item [current_overID].slide_img.src;
  }
  }


new_item ("menu",410,20);
new_item ("menuc",410,20);
new_item ("menua",410,20);
new_item ("menuh",410,20);
new_item ("menug",410,20);
new_item ("menuf",410,20);