ns4 = (document.layers);
ie4 = (document.all);
function tier1Menu(objMenu,objImage) {
  if (objMenu.style.display == "none") {
    objMenu.style.display = "";
    objImage.src = imgdown.src;
  } else {
    objMenu.style.display = "none";
    objImage.src = imgforward.src;
  }
}
var imgforward = new Image(9,9);imgforward.src="images/plus.png"
var imgdown = new Image(9,9);imgdown.src="images/minus.png"