// ==UserScript==
// @name            Redirect PDF Gateway
// @description     Rewrite pdf file links to the online viewer links
// @include         http://*
// @include         https://*
// ==/UserScript==

(function() {
  
  var links = document.getElementsByTagName("a");
  var regex = new RegExp('\\.pdf$','i');
  for (var i in links){
    var link = links[i].href;
    if (regex.test(link) && link.indexOf("pdf.openvista.jp") == -1){
      links[i].href = 'http://pdf.openvista.jp/view/' + link;
    }
  }
  
})();