Zettersten

var request = function(url, success) {
  if ('XDomainRequest' in window) {
    var xdr = new XDomainRequest();
    xdr.onload = function() {
      alert(xdr.responseText);
      success(JSON.parse(xdr.responseText));
    };
    xdr.open('GET', url);
    xdr.send(null);
  } else {

Zettersten

var addEvent = (function () {
   var filter = function(el, type, fn) {
      for ( var i = 0, len = el.length; i < len; i++ ) {
         addEvent(el[i], type, fn);
      }
   };
   if ( document.addEventListener ) {
      return function (el, type, fn) {
         if ( el && el.nodeName || el === window ) {
            el.addEventListener(type, fn, false);