function HilightMenuItem (menuitem) {
  
  SetThisClass (menuitem, "menuitem menuitemhilight");
  if (activeMenuItem == menuitem) return;
  GetObj (menuitem + "L").src = "img/arrow_right.gif";
  GetObj (menuitem + "R").src = "img/arrow_left.gif";
}

function UnhilightMenuItem (menuitem) {
  
  SetThisClass (menuitem, "menuitem");
  if (activeMenuItem == menuitem) return;
  GetObj (menuitem + "L").src = "img/empty.gif";
  GetObj (menuitem + "R").src = "img/empty.gif";
}