function random_imglink(){
  var myimages=new Array()
  myimages[1]="images/main01.jpg"
  myimages[2]="images/main02.jpg"
  myimages[3]="images/main03.jpg"
  myimages[4]="images/main04.jpg"
  myimages[5]="images/main05.jpg"
  myimages[6]="images/main06.jpg"
  myimages[7]="images/main07.jpg"
   myimages[8]="images/main08.jpg"

  var ry=Math.floor(Math.random()*myimages.length)
  if (ry==0)
     ry=1
     document.write('<img src="'+myimages[ry]+'" border=0></a>')
}
  random_imglink()