menu items being highlighted once selected

Hi,

I’m currently having difficulty with some CSS to make menu items highlighted.

Heres the website I’m working on.

http://hutchinsuk.com/dev/product/brass-bronze/

At the minute within the menu ‘PRODUCTS’ – ‘Finishes’ – ‘Metal’ – ‘Brass/Bronze’ only ‘Metal’ has been highlighted in the orange using this css

.header_menu ul li.current-menu-parent a {
color: #ed6d16;
}

How can I get the other menu items highlighted? ‘PRODUCTS’ – ‘Finishes’ – ‘Brass/Bronze’.

Any help will be much appreciated!!!

Thanks