function onReady(callback) {
  var intervalID = window.setInterval(checkReady, 250)

  function checkReady() {
    if (document.getElementsByTagName('body')[0] !== undefined) {
      window.clearInterval(intervalID)
      callback.call(this)
    }
  }
}
onReady(function () {
  $('#loading').delay(2000).fadeOut(500)
  $('#wrapper').delay(2000).fadeIn(2000)
});