function tierMenu(objMenu,objImage)
{
  if (objMenu.style.display == "none")
  {
    objMenu.style.display = "";
    objImage.src = "http://www.thedaz.com/image/minus2.gif";
  }
  else
  {
    objMenu.style.display = "none";
    objImage.src = "http://www.thedaz.com/image/plus2.gif";
  }
}