Mal, with Firefox, if you go to this page: hxxp://www.flickr.com/photos/s47zz/10167232103/ (replace 'xx' with 'tt'). yo will see this image in Flickr, but with 'Flickr' stuff around it - it is not the image you are actually seeing, but a 'page' with the image held within it...
Right click the image and you you will see a list of available sizes - select one, such as 'original'.
This will give you this page: hxxp://www.flickr.com/photos/s47zz/10167232103/sizes/o/in/photostream/ (again replace the 'xx' with 'tt').
On the image within this page you can again right click and you will get a Windows option menu:

From this menu select View Image, or Copy Image Location.
That is the actual URL for the image!!!
If you right click any image and see the above menu that is what you need!

With IE, you get a different right-click menu:

Select 'Properties' and the image URL will be shown.

Does that help?

Le Presidente