disqusReady.js

$(document).ready(function() {
  window.disqus_no_style = true;

  $.getScript('http://sitename.disqus.com/embed.js', function() {
    var loader = setInterval(function() {
      if($('#disqus_thread').html().length) {
        clearInterval(loader);
        disqusReady();
      }
    }, 1000);
  });
  
  function disqusReady() {
    //whatever you can imagine
  }
});