function random_imglink(){
  var myimages=new Array()
  
 
  myimages[1]="e-banner/Recent Advances in Nanoscience and Technology copy.gif"
  
  
  var imagelinks=new Array()
  
 
  imagelinks[1]="http://www.benthamscience.com/ebooks/9781608050536/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()