> but in the img tag, try src="display_image.php?id=anId"
> and in display_image.php, test if the user is authorized before displaying 
> the image.
> Then a direct call to display_image.php?id=anId would still have a chance to 
> authenticate the user.

Forgot to reiterate:
Keep the images where only PHP can read them.
If you have the images in a file or a database, use header, and echo or 
fpassthru on the data.

Something like "jan at anh dot sk"
http://php.he.net/image

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