<script>function random_imglink(){
var myimages=new Array()
//specify random images below. You can have as many as you wish
  myimages[1]="image link here"
  myimages[2]="image link here"
  myimages[3]="image link here"
  myimages[4]="image link here"
  var ry=Math.floor(Math.random()*myimages.length)
  if (ry==0)
  ry=1
  document.write('<img width="100%" src="'+myimages[ry]+'" border=0>')
}
random_imglink()
</script>