Addthis Async and conditional load script

addthis_async_load.js

  if(jQuery('.namespace_addthis').length > 0) {
    jQuery.ajaxSetup({cache: true});
    jQuery(window).load(function(){jQuery.getScript('//s7.addthis.com/js/250/addthis_widget.js#pubid=', true);});
    jQuery(".namespace_addthis").each(function() {
      jQuery(this).html('<div class="addthis_toolbox addthis_default_style addthis_32x32_style" ><a class="addthis_button_facebook"></a><a class="addthis_button_twitter"></a><a class="addthis_button_email"></a> <a class="addthis_button_compact"></a><a class="addthis_counter addthis_bubble_style"></a></div>');
    })
  }