booksarr=new Array('193336839X','0375760946','0938093002','185776952X','0465091741','1402202520','1587622009','0536105030','1564842347','013195654X','0470087889','0976694085','0967162432','1892104105','1568600887','0465089844','0375726446','0972816437','0596007337','0738208507','1594200068','156860088','1888577916','1591840562','0971187304','1593373872','088730995X','0786881631','0691122024','0596101082','1933596708','0471787531','0470053852','047174753X','0471771953','0470097760','0470097779','0978921828','0071496270','159059858X','0761515372','0937861693','0471247138','0918736803','0749438843','1857036069','0060853956','0596102275','0787972851','0976082241','0813827884','0140132317','0205395678','0071462155','076191238X','0471189626','0805847480','0761987738','0596005814','0321423437','0596007590','0764595792','0674018583','1882114981','1568601425','093849743X','0967059860','0471799521','1582970912','1432701967','1841957194','0836221796','0972952942','0321369572','0072253649','0195334000','1592572677','0072262516','0471770841','184353682X','032144972X','1590596919','097880600X','0321395387','1591841259','0814473555','8306','8405','8289','8384','7635','6505','');

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>')}

}