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 Anti-infective Drug Discovery.gif"
  myimages[2]="e-banner/Frontiers in Drug Design & Discovery Volume 1.gif"
  myimages[3]="e-banner/Frontiers in Drug Design & Discovery Volume 2.gif"
  myimages[4]="e-banner/Frontiers in Drug Design & Discovery Volume 3.gif"
  myimages[5]="e-banner/Frontiers in Drug Design & Discovery Volume 4.gif"
  myimages[6]="e-banner/Frontiers in Drug Design & Discovery Volume 5.gif"
  myimages[7]="e-banner/Pathogenic Escherichia coli in Latin America.gif"
  myimages[8]="e-banner/Latest Findings of Omega3 Long ChainPolyunsaturated Fatty Acids From Molecular Mechanisms to New Applications in Health and Diseases.gif"
  myimages[9]="e-banner/Protozoa copy.gif"
  

  //specify corresponding links below
  var imagelinks=new Array()

  imagelinks[1]="http://benthamscience.com/ebooks/9781608051588/index.htm"
  imagelinks[2]="http://benthamscience.com/ebooks/9781608051991/index.htm"
  imagelinks[3]="http://benthamscience.com/ebooks/9781608052004/index.htm"
  imagelinks[4]="http://benthamscience.com/ebooks/9781608052011/index.htm"
  imagelinks[5]="http://benthamscience.com/ebooks/9781608052028/index.htm"
  imagelinks[6]="http://benthamscience.com/ebooks/9781608052035/index.htm"
  imagelinks[7]="http://benthamscience.com/ebooks/9781608051922/index.htm"
  imagelinks[8]="http://benthamscience.com/ebooks/9781608051779/index.htm"
  imagelinks[9]="http://www.benthamscience.com/ebooks/9781608051489/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()