Need search function based on product attributes

Hello,

I need a product search function same as Magento. You can see demo here: http://demo.magentocommerce.com/electronics/cellphones Please see SORT BY box at left side.

I am using latest version of opencart v1.4.9.1
I am developing on my localhost pc so I cannot show you my cart front page but it is currently with default data and I am working with theme.


Thanks
Bimal

there are commercial mods that will give you this functionality called Product Extra Fields and Layered Navigation.