the link you used is
the problem with that link lies '/.../' the periods mean a directory, but the computers dont know what directory its under. Therefore causing and error.
go ahead and upload the image to catforum avatars. Go to Profile, Scroll down, and under "Upload Avatar from your machine:" Click Browse. Find your avatar and click open, The click Submit. Should work.
Go look at the top corner of this page. Click 'Cat Photos', and upload it there.
Then, once uploaded, right click your image and goto Properties. Select the link your image and Copy it. Come back here and type
paste the image location
With  around the IMG's, ok? That help any?
Or you could send me the picture to my email addy and I can upload it for you.
Oh, I see what you did. Yeah, you can't just take the url that is in the address bar, because that is for the whole entire page.
What you do is click directly on one of your pictures in the cat picture section (you have to be right in the page where it just shows the one picture of your cat, not all of them). Then right click and select properties from the mouse menu. In the properties box there is the url for that picture, copy and paste within .
Hope that helps...