I have a store at http://www.linecasting.com

When someone clicks on a Category in the sidebar menu, the menu expands to show sub categories, and the page displays the Category page with sub category text links.

I want to disable the opening of the Category page, so that the customer has to click on the sub category link in the side bar menu to open a listing of the products under that sub category.

Is this possible? Any one any ideas please

Thanks