you can probably reference your image now, like http://www.araton.pwp.bluetonder.co.uk/yourimage.gif or http://www.araton.pwp.bluetonder.co.uk/yourimage.jpg

Try putting either of those into the address bar (obviously replacing the 'yourimage' part with the actual name of your file)

If it either opens the image or prompts you to download it's in the right place and you will be able to use it as an avatar.