Modifying Search Sidebox

[dgent]

At the moment, I have the standard search sidebox with a single field and a submit button.

I want to have 3 fields, for three different search variables, and one submit button, but all three fields don't have to be filled in by the customer.

So If I was selling clothing, Id want a box for 'size', 'colour' & 'material', and the customer wrote, '10', 'Blue' and 'Denim', I want the search results to find all products with ANY of those terms in (so an OR search type)

Many thanks in advance if you can help.

David

[dgent]

Sorry, now I rethink, I want it as an AND search, and all terms need to be filled in, and ALL terms need to be found in the product listing.