// JavaScript Document
  var Open = ""
  var Closed = ""

  function preload(){
   if(document.images){
    Open = new Image(16,13)    
    Closed = new Image(16,13)
    Open.src = "open.gif"
    Closed.src = "closed.gif"}}

  function showhide(what,what2){
   if (what.style.display=='none'){
    what.style.display='block';
    what2.src=Open.src}
   else{
    what.style.display='none'
    what2.src=Closed.src
  }}