open all links in page with target="_blank" in a new window

blank_window.js

window.onload = function() {
  var links = document.getElementsByTagName('a'), len = links.length;

  for(var i = 0; i < len; i++) {
    links[i].addEventListener('click', function(event) {
  
      if (this.target === '_blank') {
        window.open(this.url, '_blank');
      }
  
      event.preventDefault();
    });
  }
}