function random_imglink(){
  var myimages=new Array()
  //specify random images below. You can have as many as you wish
  myimages[1]="e-banner/Frontiers in Drug Design & Discovery Volume 1 copy.gif"
  myimages[2]="e-banner/Frontiers in Drug Design & Discovery Volume 2 copy.gif"
  myimages[3]="e-banner/Frontiers in Drug Design & Discovery Volume 3 copy.gif"
  myimages[4]="e-banner/Frontiers in Drug Design & Discovery Volume 4 copy.gif"
  myimages[5]="e-banner/Frontiers in Drug Design & Discovery Volume 5 copy.gif"
  myimages[6]="e-banner/Frontiers in Medicinal Chemistry Volume 1 copy.gif"
  myimages[7]="e-banner/Frontiers in Medicinal Chemistry Volume 2 copy.gif"
  myimages[8]="e-banner/Frontiers in Medicinal Chemistry Volume 3 copy.gif"
  myimages[9]="e-banner/Frontiers in Medicinal Chemistry Volume 4 copy.gif"
  myimages[10]="e-banner/Frontiers in Medicinal Chemistry Volume 5 copy.gif"
  myimages[11]="e-banner/Reviews in Pharmaceutical and Biomedical Analysis copy.gif"
  myimages[12]="e-banner/Glucose Homeostasis and Insulin Resistance copy.gif"
  myimages[13]="e-banner/Protein Misfolding Disorders A Trip into the ER copy.gif"
  myimages[14]="e-banner/Current Technologies to Increase the Transdermal Delivery of Drugs copy.gif"
   myimages[15]="e-banner/Mechanisms of Landscape Rehabilitation and Sustainability copy.gif"

  //specify corresponding links below
  var imagelinks=new Array()
  imagelinks[1]="http://benthamscience.com/ebooks/9781608051991/index.htm"
  imagelinks[2]="http://benthamscience.com/ebooks/9781608052004/index.htm"
  imagelinks[3]="http://benthamscience.com/ebooks/9781608052011/index.htm"
  imagelinks[4]="http://benthamscience.com/ebooks/9781608052028/index.htm"
  imagelinks[5]="http://benthamscience.com/ebooks/9781608052035/index.htm"  
  imagelinks[6]="http://benthamscience.com/ebooks/9781608052042/index.htm"
  imagelinks[7]="http://benthamscience.com/ebooks/9781608052059/index.htm"
  imagelinks[8]="http://benthamscience.com/ebooks/9781608052066/index.htm"
  imagelinks[9]="http://benthamscience.com/ebooks/9781608052073/index.htm"
  imagelinks[10]="http://benthamscience.com/ebooks/9781608052080/index.htm"
  imagelinks[11]="http://benthamscience.com/ebooks/9781608051908/index.htm"
  imagelinks[12]="http://benthamscience.com/ebooks/9781608051892/index.htm"
  imagelinks[13]="http://www.benthamscience.com/ebooks/9781608050130/index.htm"  
  imagelinks[14]="http://benthamscience.com/ebooks/9781608051915/index.htm"
  imagelinks[15]="http://benthamscience.com/ebooks/9781608051687/index.htm"

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

  if (ry==0)
     ry=1
     document.write('<a href='+'"'+imagelinks[ry]+'"'+' onclick="window.open(this.href); return false;"><img src="'+myimages[ry]+'" border=0></a>')
}

  random_imglink()