arImages=new Array(
  "http://bus.utk.edu/semba_dev04/images/semba_head_foot/semba_mastheadphotos.jpg",
  "http://bus.utk.edu/semba_dev04/images/semba_head_foot/semba_mastheadphotos2.jpg",
  "http://bus.utk.edu/semba_dev04/images/semba_head_foot/semba_mastheadphotos3.jpg"
);

rand=Math.floor(arImages.length*Math.random());
document.write('<img src="'+arImages[rand]+'" width="342" height="70" alt="EMBA Rotating Photos">');