booksarr=new Array('0071377727','189185934X','1591401054','0471444588','1852333316','0963530909','B000IWYX8A','849763229X','850107411X','8449316766','0791468399','1412927676','0787971472','0205375642','140203640X','0874257174','0471203025','0787960519','0762103310','0802776841','091641065X','0262061945','0262692198','0802776698','0787981699','1562863908','0787976210','0820467863','0415216907','1843764083','0205152570','0542330385','0762310480','0130325465','0787975850','1891859331','007288021X','1418859877','1591404088','9026519699','0072924586','1563084775','0738208612','0262042045','1581126581','1882114981','0521809592','0618379703','0787977578','0415383102','0787972304','1591582504','0415953197','0810858576','0738206083','0738208507','');

if(booksarr.length > 6){
function getRndImg() {
  var rnd = Math.round(Math.random()*(booksarr.length-1));
  return booksarr[rnd]
}
function makeArray() {
  var list = "";
  var arr = new Array();
  cnt = 0;
  while (cnt!=nofRandom) {
    var img = getRndImg();
    if (list.indexOf(img)==-1) {
      arr[cnt++]=img
      list+=img;
    }
  }
  return arr;
}
nofRandom = 6;


arr = makeArray();
for (i=0;i<arr.length;i++)
    {document.write('<iframe src="http://rcm.amazon.com/e/cm?t=masternewmedi&o=1&p=8&l=as1&asins=' + arr[i]+ '&fc1=000000&IS2=1&lt1=_blank&lc1=0000FF&bc1=000000&bg1=FFFFFF&f=ifr" style="width:120px;height:240px;" scrolling="no" marginwidth="0" marginheight="0" frameborder="0"></iframe><br><br>')}

}