function random_imglink(){
  var bannerimages=new Array()
  //specify random images below
  bannerimages[1]="/images/clampheader.jpg"
  bannerimages[2]="/images/hooksheader.jpg"
  bannerimages[3]="/images/knivesheader.jpg"
  bannerimages[4]="/images/screwbitsheader.jpg"

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

  if (ry==0)
     ry=1
     document.write('<img src="'+bannerimages[ry]+'" width="440" height="50" alt="Wholesale tools and quantity discounts" border="0">')
}

  random_imglink()