Search without keyword

[Jaskaran]

Hello to all!!

 

I have header search on my site with a text box and drop down of categories and a search button.

 

if i select any category,and do not put any keyword in search box,then press search button it directs to the advanced_search.php.

 

But i want it will show all product or subcategories of selected category(case of without enter anything in search box).

 

How it can possible??

 

need a quick reply.please!!

 

Regards

Jaksaran