rss.php how to add pubDate to products xml (for rss graffiti, facebook) and view hotlinked images???

[mmsh]

hi,
i'm able to edit rss.php to view last 10 products added... but i have a problem with rss graffiti from facebook... the error is "Missing publication date in 10 items in your feed." ...One or more feed entries do not indicate their date of publication. In RSS there is an element called pubDate which indicates the date when the item was published (created). RSS Graffiti relies on that date to distinguish between old and new items. "
then... furthermore: my images are not on my server 'cause are url hotlinked -> my supplier catalogue is very big to manually upload every image.... url image is saved on the field "supplier_reference" so the url product image becomes product.supplier_reference .... hope this helps
so how can i do to view images too? Thank you very much