title: how to make new FormData() work on IE browsers
body: <p>How can I make this work on IE?
  This won't work on IE, new FormData() api is not supported by IE browsers, is there any other api equivalent to new FormData() in IE?</p>
  
  <pre><code>var fd = new FormData();
  fd.append( "userfile", $("#userfile")[0].files[0]);
  
  $.ajax({
      url : '/user/ajax_upload/',
      type: 'POST',
      contentType:false,
      cache: false,
      data: fd,
      processData: false,
      beforeSend :function(){
      },
      success : function( data ) {
          $('#popupbox').html(data);  
      }
  });
  </code></pre>