function random_imglink(){
  var myimages=new Array()
  myimages[01]="image/random/banner_09_01.jpg" 
  myimages[02]="image/random/banner_09_02.jpg"
  myimages[03]="image/random/banner_09_03.jpg"
  myimages[04]="image/random/banner_09_04.jpg"

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

  if (ry==0)
     ry=01
     document.write('<div position=relative top=0>')
     document.write('<img src="'+myimages[ry]+'" border=0 height=180 width=900>')
     document.write('</div>')
}

  random_imglink()