function random_imglink(){
  var myimages=new Array()  
  myimages[1]="images/foto1.jpg"  
  myimages[2]="images/foto3.jpg"
  myimages[3]="images/foto4.jpg"
  myimages[4]="images/foto2.jpg"

  //specify corresponding links below
  var imagelinks=new Array()  
  imagelinks[1]="#"
  imagelinks[2]="#"
  imagelinks[3]="#"
  imagelinks[4]="#"

  var ry=Math.floor(Math.random()*myimages.length)

  if (ry==0)
     ry=1
     document.write('<img src="'+myimages[ry]+'" border=1 width="450" height="204">')
}