Drupal 6 custom search box

Hi,

In my application I created a custom node type using CCK module. This node hawe a field price. And a category .. and some numeric fields.
I want to implement a custom search form that return nodes in a certain price range (10$ - 20$) and in a specified category. Also I want to implement more search criterias. Do you have any idea how can I achieve that using drupal 6?

Thanks a lot,
Radu