openlinksinparent.js

window.onload = function(){
  
  var iframeholder = document.getElementById('iframeholder');
  var test = document.createElement('iframe');
  var base = document.createElement('base');
  base.setAttribute('target', '_parent')
  
  test.onload = function(){
    var y = (test.contentWindow || test.contentDocument);
    if (y.document)y = y.document;
   
    y.head.appendChild(base);
    y.body.innerHTML = "<a href='#test'>test</a>";
  };
  iframeholder.appendChild(test);
  
};