Advanced search option

Hi all

I just bought this script, mainly due too the exellent service from David:o)

One of the concerns i had before buing, where the search option, which is to basic for my site and therefore i hope I can get some help making a more advanced search option.

What i would like to be able to is the following:

My main page will be categories.php - without any search option (already done).
From here, i would like the user to click on the category they are looking for and then take them to the page with all products within this category (same as default), but now comes the search option....

On the left side on this page with all the products in specific category a search option is added.

The search contains of 2 dynamic dropdown menues:
1. Category (default, is the category which the user entered on the main page)
2. Brands (list of all the brands, that are availble in the specific category - dynamic)

and then 2 inputboxes
3. Price (user can enter a max. price and the search will 'delete' all products with a price above this value)
4. Keyword (user can enter a keyword, and the search will look in name, product, brand, description)

and
5. Search button - (this search button, will replace the default search button)

Is this possible or do some of you have another solution for a dynamic product search.

Thank you
//Brian

ps. this script is running inside a joomla installation, and it is running without any probs, when using the joomla wrapper :o)