function random_imglink(){
  var myimages=new Array()
  //specify random images below. You can have as many as you wish
  myimages[1]="http://www.reservoirps.vic.edu.au/uploads/images/header1.jpg"
  myimages[2]="http://www.reservoirps.vic.edu.au/uploads/images/header2.jpg"
  myimages[3]="http://www.reservoirps.vic.edu.au/uploads/images/header3.jpg"
  myimages[4]
="http://www.reservoirps.vic.edu.au/uploads/images/header4.jpg"
  myimages[5]
="http://www.reservoirps.vic.edu.au/uploads/images/header5.jpg"
  myimages[6]
="http://www.reservoirps.vic.edu.au/uploads/images/header6.jpg"
  myimages[7]
="http://www.reservoirps.vic.edu.au/uploads/images/header7.jpg"
  myimages[8]
="http://www.reservoirps.vic.edu.au/uploads/images/header8.jpg"
  myimages[9]
="http://www.reservoirps.vic.edu.au/uploads/images/header9.jpg"
  myimages[10]
="http://www.reservoirps.vic.edu.au/uploads/images/header10.jpg"
  myimages[11]
="http://www.reservoirps.vic.edu.au/uploads/images/header11.jpg"
  //specify corresponding links below
  var ry=Math.floor(Math.random()*myimages.length)

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

  random_imglink()