(Javascript) Alterar links download para RBM

<script>

    // Alterar links de download
    // Para  http://www.piratatorrentsbr.com/
    // Por Bruno da Silva


    var DIVS = document.getElementsByTagName("div");

    for (var j=0; j< DIVS.length ; j++){

        // pegar todos links da div
        var LINKS = DIVS[j].getElementsByTagName('a');

        var k = 0;

        while ( k < LINKS.length && LINKS[k].href.search("tiny") != -1) { k++; }

        k--;

        if(!isset (LINKS[k]) || !isset (LINKS[k].href) ) continue;


        var str = LINKS[k].href;



        if(str.search("tiny") != -1) { // caso tiver algum Tiny na URL, é link para download

            var download = str; // parte que muda para RBM

            DIVS[j].innerHTML = "<br/><a href='"+download+"'><img src='http://4.bp.blogspot.com/-VZ_pIC6vVvw/Ukh0iQAtHOI/AAAAAAAABCI/eO8W_JgBVpg/s1600/images.png'/></a><br/><font size=1><a href='"+str+"'>Download sem gerenciador</a></font>";
        }

    }


function isset () {

// http://kevin.vanzonneveld.net

 var a = arguments,
    l = a.length,
    i = 0,
    undef;

  if (l === 0) {
    throw new Error('Empty isset');
  }

  while (i !== l) {
    if (a[i] === undef || a[i] === null) {
      return false;
    }
    i++;
  }
  return true;
}

</script>