7-segment display problem

Hi all. I'm just starting out trying to get my head round this
electronics thing and am building a few simple circuits that I find on
the Internet. I got a 7-segment display (common anode) and tried to
build this - http://www.kpsec.freeuk.com/projects/random.htm to
repeatedly count from 0 to 9. I've tinkered with the resistors and
have one as a 1meg pot so I can change the timing and it works, except
it does it in reverse. I mean instead of lighting all the outer LEDs
for a 0 it lights only the centre line, and for a 1 (when it should be
lighting the two rightmost LEDs) it lights all the others. So,
instead of each LED in the 7-segment display being on in each
configuration, it's being off. I hope this makes sense, and I'm sure
there's a very simple answer to why it's doing it, but I am very new
to this stuff!

Any help would be greatly appreciated.
.

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