Thank you - I think I just needed to see the word "hotlinking" so that I could do the appropriate google search
I found a list of free image hosting sites which allow hotlinking ...
http://www.findimagehost.com/image-host ... inking.php
I just clicked on the first in the list
There is a bit of a French-English issue but once you choose file from your computer just click on "C'est Parti" and they give you a list of urls for your image