function random_imglink(){
  var myimages=new Array()
  //specify random images below. You can have as many as you wish
  	//myimages[1]="e-banner/Angiogenesis.gif"
	myimages[1]="e-banner/NewDevelopmentsinMedicinalChemistry.gif"
  	myimages[2]="e-banner/FrontiersinDrugDesign&DiscoveryVolume1.gif"
  	myimages[3]="e-banner/FrontiersinCardiovascularDrugDiscovery.gif"
  	myimages[4]="e-banner/FrontiersinDrugDesign&DiscoveryVolume2.gif"
  	myimages[5]="e-banner/FrontiersinDrugDesign&DiscoveryVolume3.gif"
  	myimages[6]="e-banner/FrontiersinDrugDesign&DiscoveryVolume4.gif"
  	myimages[7]="e-banner/FrontiersinMedicinalChemistryVolume1.gif"
  	myimages[8]="e-banner/FrontiersinMedicinalChemistryVolume2.gif"
  	myimages[9]="e-banner/FrontiersinMedicinalChemistryVolume3.gif"
	myimages[10]="e-banner/FrontiersinMedicinalChemistryVolume4.gif"
	myimages[11]="e-banner/FrontiersinMedicinalChemistryVolume5.gif"
	myimages[12]="e-banner/LatestFindingsofOmega3LongChainPolyunsaturatedFattyAcidsFromMolecularMechanismstoNewApplicationsinHealthandDiseases.gif"
	myimages[13]="e-banner/FrontiersinDrugDesign&DiscoveryVolume5.gif"
  //specify corresponding links below
  var imagelinks=new Array()
  //imagelinks[1]="http://benthamscience.com/ebooks/9781608050048/index.htm"
  imagelinks[1]="http://benthamscience.com/ebooks/9781608051274/index.htm"
  imagelinks[2]="http://benthamscience.com/ebooks/9781608051991/index.htm"
  imagelinks[3]="http://benthamscience.com/ebooks/9781608051601/index.htm"
  imagelinks[4]="http://benthamscience.com/ebooks/9781608052004/index.htm"
  imagelinks[5]="http://benthamscience.com/ebooks/9781608052011/index.htm"
  imagelinks[6]="http://benthamscience.com/ebooks/9781608052028/index.htm"
  imagelinks[7]="http://benthamscience.com/ebooks/9781608052042/index.htm"
  imagelinks[8]="http://benthamscience.com/ebooks/9781608052059/index.htm"
  imagelinks[9]="http://benthamscience.com/ebooks/9781608052066/index.htm"
  imagelinks[10]="http://benthamscience.com/ebooks/9781608052073/index.htm"
  imagelinks[11]="http://benthamscience.com/ebooks/9781608052080/index.htm"
  imagelinks[12]="http://benthamscience.com/ebooks/9781608051779/index.htm"
    imagelinks[13]="http://benthamscience.com/ebooks/9781608052035/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()