It appears that using the 'nofollow' attribute in an anchor tag is invalid html, for example :-
<a href="www.adomain.com" rel="nofollow">
is not valid html. However, Google does understand the 'nofollow' attribute and it tells Google not to follow the link in question. As far as we are aware, all the other search engines just ignore the 'nofollow' attribute.
Our Link Partners box, at the bottom of our home page, is the only place where external link do not include the 'nofollow' attribute. We do this so that our Link Partners get maximum benefit from the external links that we allow. If you would like to become a Link Partner, please submit your webpage to us for review.
We would also like to point out that our use of the 'nofollow' attribute does NOT effect the operation of the store in any way!
Please feel free to contact us with any questions you may have.