offplay = new Image(150,100)
  offplay.src = "pictures/star_field.gif"
  onplay = new Image(150,100)
  onplay.src = "pictures/star_field_2.gif"

  offplay1 = new Image(150,100)
  offplay1.src = "pictures/star_field.gif"
  onplay1 = new Image(150,100)
  onplay1.src = "pictures/star_field_3.gif"