Referrals

Hi all, I am in the middle of writing a website for affiliate programs on the web, which one is the best and why kind of thing. I would like to be able to do something similar to what Amazon do on their website but I am struggling to work out how they do it so convincingly. Here is an example of what I mean: When you select an item to look at, there is a section named: <snip> Customers who bought this item also bought: blah link one - blah description blah link two - blah description Click here for more blah <snip> How is this done? Is there a reference to a new db which has the links and references them from there or do they look into sessions or cookies? Any help would be greatly appreciated, Ian. --- Randum Ian DJ / Reviewer / Webmaster, DancePortal (UK) Limited ian@danceportal.co.uk http://www.danceportal.co.uk DancePortal.co.uk - Global dance music media