var active=false

function initialize()
{
  imageMap1=new Image()
  imageMap1.src="./newtongrange_map.gif"
  imageMap2=new Image()
  imageMap2.src="./newtongrange_old_map.gif"
  currentMap=1
}

function toggleMap()
{
  if (active)
  {
    currentMap=currentMap==1?2:1
    document.images["map_image"].src=eval("imageMap"+currentMap+".src")
  }
}

function enableScript()
{
  initialize()
  active=true
}