Hi,
Please have a look to
http://otticaparisi.com/index.php/lenti-oftalmiche.
I used One Page Menu particle and it works fine.
I used the same anchor to link to main menu voices ...(using #)...
Links work as well but it doesen't start where the title section is but some rows after ... (you can check to click on "monofocali" or "multifocali" items menu (under "Lenti Oftalmiche" main menu item).