Creating query result filters dynamically

[eluser]lexusgs430[/eluser]
Hi,

Im trying to create a query filter system in codeigniter. Basically, within a particular query, Id like to be able to send a list of values returned by the main query (working with items for sale on different sites, so for instance, price, and website), output them to my sidebar, and then be able to drill down the results via the values in the sidebar. (thefind.com is a great example on what im trying to do).

Ive been trying to wrap my head around exactly how to do this all day, but no luck. If anyone could push me in the right direction it would be much appreciated. P.S. im using DMZ datamapper object oriented code igniter extension library, so I figure that might help to make it easier?