gistfile1.js

         form.ajaxForm().ajaxSubmit({
//             target: "#divToUpdate",
            url: that._options.uploadUrl,
//             dataType: "json",
            method: "POST",
            iframe: true,
            success: function(response) {
              that.insertImage(response, 
                               form.find(that._options.titleSelector).val(),
                               form.find(that._options.altSelector).val());
            }
          });