Hope is right ... use attachment (backup file).
Thank you thunderstrike for your hard work, but still i don't see additional filed added by me in your images.php while bulk editing
Other fileds are Description, Keywords, Activate, Allow comments...
edit: in my db_field_definitions.php i have added this field---
$additional_image_fields['Author'] = array($lang['Author'], "Author", 0);
so i want above new filed with other default fields during bulk edit