Add touch functionality to Autonav

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Hello there,

I have created a basic drop-down menu on a website for a Client.

(www.exceltrad.co.uk)

When you hover over the main element, the sub-pages appear.

This is fine for desktop use, but useless if you're using a touchscreen, as when you hit the top menu item, you are sent to the top page.

Does anyone know how to modify the autonav to allow a User to click the top menu item & just open the dropdown. Is this something that can be done in css?

All advice appreciated.

Matthew.