/* 
After purchasing a humble book bundle, go to your download page for that bundle. 
Open a console window for the page and paste in the below javascript.
This will download all the books in all the formats available.
*/ 
$('a').each(function(i){
   if (['MOBI', 'PDF', 'EPUB'].indexOf($.trim($(this).text())) >= 0) {
      $('body').append('<iframe id="dl_iframe_'+i+'" style="display:none;">');
      document.getElementById('dl_iframe_'+i).src = $(this).data('web');
   }
});