[Bug-wget] Wget can't download JPG images

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Wget Tech Support,

I am using GNU Wget 1.11.4.3287 on Windows Vista Ultimate.

I am trying to download a web comic from a website, which is a set of JPG images.

Here is the URL of one of the image: http://blacktapestries.comicgenesis.com/comics/20020711.jpg
It's real size is 600px X 800px (85.66 KB)
Unfortunately, every time I use Wget to download it, all I get is 1px X 1px (1.09 KB) image.
It seems to be able to download JPG images from other websites, so it isn't a format issue.

When I attempt download all the web comic's pages from the parent directory, using this command:

wget --no-parent -ckr http://blacktapestries.comicgenesis.com/comics

I get this response:

SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc
syswgetrc = C:\Program Files\GnuWin32/etc/wgetrc
--2009-06-01 22:00:27-- http://blacktapestries.comicgenesis.com/comics
Resolving blacktapestries.comicgenesis.com... 66.220.2.20
Connecting to blacktapestries.comicgenesis.com|66.220.2.20|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://blacktapestries.comicgenesis.com/comics/ [following]
--2009-06-01 22:00:27-- http://blacktapestries.comicgenesis.com/comics
Reusing existing connection to blacktapestries.comicgenesis.com:80.
HTTP request sent, awaiting response... 403 Forbidden
2009-06-01 22:00:30 ERROR 403: Forbidden.

I don't understand why this is happening because I am able to download the images manually using the Firefox internet browser.

What am I doing wrong and how do I fix it?

Thank you for you assistance,

Steven