if (document.images) {

  bioOn = new Image();
  bioOn.src = "img/bio-button-hi.gif"
  bioOff = new Image();
  bioOff.src = "img/bio-button.gif"

  albOn = new Image();
  albOn.src = "img/albums-button-hi.gif"
  albOff = new Image();
  albOff.src = "img/albums-button.gif"

  appOn = new Image();
  appOn.src = "img/appearances-button-hi.gif"
  appOff = new Image();
  appOff.src = "img/appearances-button.gif"

  bokOn = new Image();
  bokOn.src = "img/book-button-hi.gif"
  bokOff = new Image();
  bokOff.src = "img/book-button.gif"

  stoOn = new Image();
  stoOn.src = "img/stories-button-hi.gif"
  stoOff = new Image();
  stoOff.src = "img/stories-button.gif"

  conOn = new Image();
  conOn.src = "img/contact-button-hi.gif"
  conOff = new Image();
  conOff.src = "img/contact-button.gif"

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}