function random_imglink(){
  var myimages=new Array()
  //specify random images below. You can have as many as you wish
  myimages[1]="e-banner/Metal-Based.gif"
  myimages[2]="e-banner/Multiphase Flow and Heat Transfer (Volume 1 ) copy.gif"
  myimages[3]="e-banner/Multiphase Flow and Heat Transfer (Volume 2) copy.gif"
  myimages[4]="e-banner/Atomic Coherence copy.gif"
  myimages[5]="e-banner/Copper Quest for a Cure copy.gif"
  myimages[6]="e-banner/Mitigate Magnetic Fields copy.gif"
  myimages[7]="e-banner/Exponential Data Fitting and its Applications copy.gif"

  var imagelinks=new Array()
  imagelinks[1]="http://benthamscience.com/ebooks/9781608050383/index.htm"
  imagelinks[2]="http://benthamscience.com/ebooks/9781608050802/index.htm"
  imagelinks[3]="http://benthamscience.com/ebooks/9781608050949/index.htm"
  imagelinks[4]="http://benthamscience.com/ebooks/9781608050857/index.htm"
  imagelinks[5]="http://benthamscience.com/ebooks/9781608050604/index.htm"
  imagelinks[6]="http://benthamscience.com/ebooks/9781608050390/index.htm"
  imagelinks[7]="http://benthamscience.com/ebooks/9781608050482/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()