Revised navbar

I'm wondering how usable it is for someone who is handicapped though?

I asked my moms boyfriend to see whether or not it is easy for him to use (He's blind, and partially deaf).

I have ensured that no functionality is lost when javascript is disabled, and the tabs remain large clickable areas to get around the site. In due course they will get keyboard navigation accelerator keys too, so hopefully it's fairly accessible.
 
I don't click in the navbar, except for the link I want to go to.
I hover over the arrow, which slides it out and I select what I want, if it isn't on the current page.
 
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