var picArray = new Array("topshots/arabesque.jpg", "topshots/class.jpg", "topshots/dancejpg.jpg", "topshots/dancers.jpg", "topshots/flying.jpg", "topshots/longarms.jpg", "topshots/opera.jpg", "topshots/reddress.jpg");
  var picNum = parseInt(picArray.length);
  with (Math) {
  var chPic = floor(random() * picNum);
  }