gistfile1.js

var google_conversion_id = 1234567890;
var google_custom_params = window.google_tag_params;
var google_remarketing_only = true;

window.onload = function(){
  // save old document.write
  var dw = document.write;

  // change document.write temporary
  document.write = function(node){
    $("body").append(node);
  }

  $.getScript("http://www.googleadservices.com/pagead/conversion.js", function() {
      // replace the temp document.write with the original version
      setTimeout(function() {
          document.write = dw;
      }, 100);
  });
};