which core files (controller,model and resource files) specifically needs to be edited to add check-boxes on layered navigation in the filter block in Magento.
What I have done till now is that I have added check-boxes and a JavaScript file which extracts ids of the products and then sends them via GET parameter to the controller.
I am not able to proceed beyond this since I am new Developer and do not know how is the controll passed and handled.
so, I want to know which all files do I need to override to make this feature functional?