Superfish top level active link marker

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I am using superfish as my primary menu.

When someone is on a page in a sublevel of the menu I would like that pages top level link to show the active CCS element too.

ie In the main menu I have rolled over "products" and selected "product d" from the drop down menu. Once the page is loaded I would like the top level link of "products" to show up as active so that the users have some idea where they are on the site.

I guess there needs to be an extra call in the php of the view file using the "nav-selected" css element to do this but my php knowledge is near zero at present.

Any help would be gratefully received.

Cheers
David

backstageboy