function toggleListState(idPrefix,elemId) {
  Effect.toggle(idPrefix+elemId,'blind')
  arrow = document.getElementById(idPrefix+elemId+"-arrow")
  if (states[elemId] == "closed") {
    arrow.innerHTML="↓"
    states[elemId] = "open"
    eraseCookie("box-state-"+elemId,"/games")
  } else {
    states[elemId] = "closed"
    arrow.innerHTML="→"
    createCookie("box-state-"+elemId,states[elemId],"/games")
  }
}