function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

function convertPdfLinks() {
  var links = document.getElementsByTagName('a');
  var pdf_regex = new RegExp('pdf$','i');
  for (var i = 0; i < links.length; i++) {
    if (pdf_regex.test(links[i].getAttribute('href'))) {
      links[i].href='http://view.samurajdata.se/ps.php?url='+links[i].href;
    }
  }
}

addLoadEvent(convertPdfLinks);