Ok, here is what I found out more about the problem -
Please read this post because I have added the previous post below, so that
you could ignore the preceeding one.. thanks.. 

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I cant understand how its possible, But, here is what is happening..

When I try to download all images from a site called lets say using following
string -

+www.abc.com/images/*.jpg 

I get an error log which mainly says 403 Forbidden

But when I use Firefox/IE to view a single image using 

www.abc.com/images/image.jpg 

It works..  

I have turned robot.txt off to see if anything changes, but it doesnt ..
Please help me fix this problem. Atleast please let me know what I am missing
here. 

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Now, i tried visiting without giving the file name image.jpg at the end in
browser

www.abc.com/images

I got FORBIDDEN message in the browser. So, it works if a full string is
given, but does not work to list the directory structure.

Can this be overcome by HTTrack ? Because they way that site wants me to see
the images is by clicking on thumbnails which take me to the images under
www.abc.com/images folder files .  The site is free , its just that its kinda
painful to keep clicking back and forth buttons just to reach the image via
thumbnail =/

Thanks in anticipation

Tatya